Frequently Asked Questions
Answers to the questions we hear most from facility managers, consultants, and procurement teams about our water and wastewater treatment equipment.
Air Blowers
Grafil UF Membrane
Grafil MBR Membrane
Dosing Pump
Screw Press
Sukrut UV Disinfection
Quachip MBBR Media
Electromagnetic Flow Meter
Motorised Valve
Waste Water Equipment
Air Blowers
View Air Blowers product page →What types of air blowers does QuaSys supply?
QuaSys Inc. supplies Roots/Twin-Lobe Blowers (Kay brand), Centrifugal Blowers (Everest, Swam), High-Speed Turbo Blowers, and Multistage Centrifugal Blowers to clients. Each type suits different flow-pressure requirements. Call +91 95408 15659 for sizing advice.
How do I select the right air blower for STP aeration?
For STP aeration, key parameters are: aeration tank volume, BOD loading (kgBOD/day), oxygen transfer requirement (kgO₂/hr), diffuser submergence depth (for pressure calculation), and ambient temperature. QuaSys performs complete aeration calculations and recommends the correct blower model and kW rating.
What is the difference between a roots blower and a centrifugal blower?
Roots blowers are positive displacement — they deliver constant flow regardless of pressure and are best for wastewater aeration (0.3–1 kg/cm²). Centrifugal blowers deliver variable flow with pressure — energy-efficient for large volume, lower pressure applications. Turbo blowers combine centrifugal action with variable speed drives for maximum energy efficiency.
Can air blowers be fitted with acoustic enclosures?
Yes. Roots blowers generate 80–95 dB(A) noise. Acoustic enclosures with ventilation fans, access doors, and vibration isolation mounts reduce noise to below 70 dB(A). QuaSys supplies acoustic enclosure packages for all blower models supplied to India clients.
Do you supply VFD-controlled blowers for energy saving?
Yes. All centrifugal and turbo blower models supplied by QuaSys can be combined with Variable Frequency Drives (VFD) for energy-efficient variable-speed operation. VFD-controlled blowers save 20–40% energy compared to fixed-speed units on variable aeration demand applications.
Grafil UF Membrane
View Grafil UF Membrane product page →What is the price of Grafil UF Membrane?
Grafil UF Membrane pricing depends on membrane surface area and system configuration. QuaSys Inc. provides a specification-based quotation once we understand your flow rate and application — call +91 95408 15659 or share your requirement for a free quote.
What is the difference between UF and RO membrane?
UF membranes have pore sizes of 0.01–0.1 micron and remove suspended solids, bacteria, and large viruses but do not remove dissolved salts. RO membranes (0.0001 micron) remove dissolved salts, TDS, and all contaminants. UF is commonly used as pre-treatment before RO to protect RO membranes from fouling.
How often do Grafil UF membranes need replacement?
With proper operation and regular CIP (Clean-In-Place) cleaning, Grafil UF membranes last 5–10 years. Membrane life depends on feed water quality and operating conditions. QuaSys provides CIP chemical supply and membrane replacement services.
Can Grafil UF membranes handle high turbidity feed water?
Grafil UF membranes can handle feed water up to 50–100 NTU turbidity with appropriate pre-screening. For very high turbidity (100+ NTU), a pre-filtration stage (sand filter or micro-screen) is recommended before the UF system to extend membrane life.
Does QuaSys provide UF system design and commissioning?
Yes. QuaSys Inc. provides complete technical support for UF system design, module sizing, skid engineering, and commissioning for clients. Our engineers assist with operating parameter setup, CIP protocol, and operator training.
Grafil MBR Membrane
View Grafil MBR Membrane product page →What is the cost of Grafil MBR Membrane?
Grafil MBR Membrane cost depends on your STP capacity, membrane area, and system configuration. Total installed cost also varies with civil work, blowers, and automation included. QuaSys Inc. provides a project-specific quotation for India clients after understanding your treatment capacity — call +91 95408 15659 or share your project details.
What is the difference between MBR and MBBR technology?
MBBR (Moving Bed Biofilm Reactor) uses plastic biofilm carriers in an aeration tank and requires a secondary clarifier for solid-liquid separation. MBR (Membrane Bioreactor) uses submerged membranes instead of a clarifier, producing much higher quality effluent (BOD <5 mg/L vs 10–20 mg/L for MBBR) in a smaller footprint, but at higher capital cost.
How often does MBR membrane need cleaning?
MBR membranes require daily relaxation cycles (suction off for 2–5 minutes per hour), weekly maintenance cleaning with sodium hypochlorite, and intensive CIP cleaning every 6–12 months depending on mixed liquor SS concentration and local water quality.
Can QuaSys supply both MBR membranes and aeration blowers?
Yes. QuaSys Inc. supplies complete MBR system packages including Grafil MBR Membrane cassettes and Kay Roots Blowers for coarse bubble aeration of the membrane cassettes. This eliminates multiple vendor coordination for your India project.
What flux rate should I design for Grafil MBR membranes?
Design flux for Grafil MBR membranes is typically 15–25 LMH (litres per square metre per hour) for domestic sewage applications. Peak flux should not exceed 30–35 LMH. Our engineers calculate exact membrane area and sizing for your India project flow and quality parameters.
Dosing Pump
View Dosing Pump product page →What is the price of a Toshcon or SEKO Dosing Pump?
Dosing pump pricing varies with flow rate, pressure rating, and control features — a small solenoid pump and a large motor-driven unit differ significantly in cost. QuaSys Inc. provides an exact quotation once we know what chemical you're dosing and at what rate for India. Call +91 95408 15659 for a free quote.
Which dosing pump is suitable for sodium hypochlorite dosing?
Sodium hypochlorite (bleach) requires a pump with PVDF or PVC pump head, PTFE or Viton diaphragm, and ceramic balls or PVDF ball valves. Toshcon models with auto-de-aeration are preferred since hypochlorite degasses. QuaSys recommends the correct model for your concentration and flow rate.
Can dosing pumps be controlled by a 4-20mA signal from a PLC?
Yes. Most SEKO and premium Toshcon dosing pumps accept 4-20mA or pulse signals for proportional dosing control. This allows integration with flow meters for flow-proportional chemical dosing — essential for RO antiscalant and STP chemical dosing systems. QuaSys advises on control wiring for India projects.
How often do dosing pump diaphragms need replacement?
Dosing pump diaphragms typically last 6–18 months depending on chemical aggressiveness and pump duty cycle. PTFE diaphragms last longer than rubber. QuaSys stocks replacement diaphragm kits and ball valve sets for fast supply to India clients.
What is the difference between Toshcon and SEKO dosing pumps?
Toshcon is a solenoid-driven diaphragm pump — compact, low-cost, suitable for flows up to 30–50 LPH. SEKO uses a motor-driven mechanism — quieter, higher accuracy, suitable for flows from 10 LPH to 2,000 LPH and for more demanding applications. QuaSys recommends the right brand and model for your specific requirement.
Screw Press
View Screw Press product page →What is the price of a Screw Press?
Screw press pricing varies significantly with capacity — a small 1-5 kg DS/hr unit and a large 200-500 kg DS/hr machine are very different investments. QuaSys Inc. provides a project-specific quotation once we understand your sludge volume and characteristics for India. Call +91 95408 15659 for a free quote.
What cake dryness can a screw press achieve?
Screw press machines typically achieve 18–25% dry solids content in the dewatered sludge cake. This depends on sludge type (biological vs chemical), polymer dosage, and screen slot size. Biological activated sludge from STPs typically dewaters to 18–22% DS. QuaSys optimises polymer dosing for maximum dryness at your India plant.
How does a screw press compare to a filter press or centrifuge?
Screw press: continuous operation, lowest power (0.5–3 kW), lowest maintenance, 18–22% cake DS. Filter press: batch operation, high labour, 30–40% cake DS, higher polymer cost. Centrifuge: continuous, high power (15–30 kW), higher maintenance, 20–25% cake DS. For most STP applications, screw press is the optimal choice on lifecycle cost.
Does the screw press require polymer conditioning?
Yes. Biological sludge requires polymer (polyelectrolyte) conditioning before screw press dewatering to aggregate fine particles for effective water release. QuaSys supplies integrated polymer preparation and dosing units with the screw press for India projects, with polymer dosage optimised during commissioning.
How long do screw press screen segments last?
Screen segments (the cylindrical filtering screen) typically last 3–7 years depending on sludge abrasiveness and operating hours. QuaSys stocks replacement screen segments for common screw press models and dispatches to India clients for scheduled replacement.
Sukrut UV Disinfection
View Sukrut UV Disinfection product page →What is the price of a Sukrut UV system?
Sukrut UV system pricing depends on flow rate and application — a small residential unit and a large industrial system differ significantly in cost. QuaSys Inc. provides a specification-based quote for India clients — call +91 95408 15659 for a free, no-obligation quotation.
How often do UV lamps need replacement?
Sukrut UV lamps have a rated life of 8,000–12,000 hours (approximately 12–18 months of continuous operation). UV output degrades gradually — most controllers display remaining lamp life percentage and trigger alarms when replacement is due. QuaSys supplies replacement lamps for all Sukrut UV models to India clients.
Is UV disinfection effective against all pathogens?
UV at the correct dose (40 mJ/cm² minimum for potable water) inactivates 99.99%+ of bacteria (E. coli, Coliforms), viruses (Hepatitis A, Norovirus), and protozoa (Cryptosporidium, Giardia). UV dose effectiveness depends on water UV transmittance — turbid or coloured water reduces UV penetration and requires pre-filtration.
Can UV replace chlorination completely?
UV can replace primary disinfection for point-of-use or contained water systems. However, for water distribution networks where residual disinfectant is needed to prevent recontamination, UV is used as primary disinfection followed by a low residual chlorine dose. For STP effluent reuse in closed systems (toilet flushing, horticulture), UV alone is sufficient.
Does QuaSys supply UV systems for STP effluent reuse?
Yes. QuaSys Inc. supplies Sukrut UV disinfection systems specifically sized for STP treated effluent reuse applications. After UF or sand filtration polishing, UV disinfection makes the treated water safe for toilet flushing and horticulture reuse as per CPCB guidelines.
Quachip MBBR Media
View Quachip MBBR Media product page →What is the price of Quachip MBBR Media?
Quachip MBBR Media pricing is based on the volume of media required, which depends on your reactor size and BOD load. QuaSys Inc. calculates the exact quantity and cost once we understand your treatment capacity for India — call +91 95408 15659 or share your reactor volume for a free quote.
What filling ratio should I use for Quachip MBBR Media?
Standard filling ratio for aerobic MBBR reactors is 50–67% by volume. Higher ratios restrict carrier movement and oxygen transfer. Our engineers calculate the exact filling ratio, reactor volume, and media quantity needed for your treatment capacity and BOD/COD loading.
How long does MBBR biofilm take to develop?
Initial biofilm development on new Quachip media takes 4–8 weeks under normal operating conditions. Seeding with active sludge from an existing STP accelerates startup to 2–3 weeks. QuaSys provides detailed startup and seeding protocols for India projects.
Can Quachip media be used to upgrade an existing STP?
Yes. MBBR retrofits involve adding Quachip carriers to an existing aeration tank with retention screens to contain the media. This increases biological treatment capacity by 50–100% in the same tank volume without major civil work — an ideal upgrade option for overloaded STPs.
Does QuaSys supply complete MBBR systems including blowers?
Yes. QuaSys Inc. can supply integrated MBBR system packages for India including Quachip MBBR Media, Kay Roots Blowers for aeration, and retention screens. This simplifies procurement and ensures all components are correctly matched.
Electromagnetic Flow Meter
View Electromagnetic Flow Meter product page →What is the price of an Electromagnetic Flow Meter?
Electromagnetic flow meter pricing depends on pipe diameter, lining material, and output/communication options — a small DN25 meter and a large DN300+ meter differ significantly in cost. QuaSys Inc. provides a project-specific quotation for India clients — call +91 95408 15659 or share your pipe size and application.
What minimum conductivity is required for a mag flow meter?
Electromagnetic flow meters require the liquid to have minimum electrical conductivity of 5 μS/cm. Tap water (50–500 μS/cm), wastewater (200–1000 μS/cm), and most industrial liquids exceed this easily. Mag meters do not work with hydrocarbons, ultrapure water, or gases.
What straight pipe run is required for installation?
Standard installation requires 5D upstream and 2D downstream straight pipe runs (D = pipe diameter). Compact mag meters with built-in conditioning may need less. QuaSys provides installation drawings specific to your piping layout.
Can electromagnetic flow meters measure wastewater with solids?
Yes. Full-bore electromagnetic flow meters with ceramic or rubber liners and Hastelloy electrodes handle wastewater, sludge, and slurries with solids up to 10% by volume. The correct liner and electrode material selection is critical — our team advises based on your fluid composition.
Do QuaSys mag meters come with calibration certificates?
Yes. All electromagnetic flow meters supplied by QuaSys Inc. come with factory calibration certificates. NABL-accredited third-party calibration certificates can be arranged on request for India projects requiring regulatory documentation.
Motorised Valve
View Motorised Valve product page →What is the price of a Motorised Valve?
Motorised valve pricing depends on line size, torque rating, and control type (on-off vs modulating). QuaSys Inc. provides an exact quote once we know your line size and duty requirement for India — call +91 95408 15659 or share your specification for a free quote.
What actuator control signal is standard for motorised valves?
Standard control signals are: 24V AC/DC for on-off control (open/close commands), and 4-20mA or 0-10V for modulating control (0–100% position). Most PLC and SCADA systems in India support both. QuaSys selects the correct actuator with the right control input for your India automation project.
What is a fail-safe motorised valve?
A fail-safe (spring-return) motorised valve automatically moves to a predetermined safe position (normally closed or normally open) when electrical power is lost. This is essential for fire safety systems, chemical isolation valves, and critical process lines where an uncontrolled open or closed valve on power failure would be dangerous.
Can motorised valves handle slurry or wastewater?
For wastewater and slurry, resilient-seated butterfly valves with EPDM or NBR seats and ductile iron discs are recommended. For chemical lines, PVC or SS316 ball valves with PTFE seating are preferred. QuaSys advises on correct valve material selection for the specific fluid in your India installation.
Do you supply electric actuators separately for existing valves?
Yes. QuaSys supplies standalone electric actuators that can be retrofitted to existing butterfly, gate, and ball valves with ISO 5211 mounting pads. We confirm actuator torque requirements and mounting compatibility for your specific valve before supply to India clients.
Waste Water Equipment
View Waste Water Equipment product page →Can QuaSys supply complete STP/ETP equipment for a project?
Yes. QuaSys Inc. is a one-stop supplier for complete STP and ETP equipment — including aeration blowers, MBBR media, membranes, dosing pumps, flow meters, UV disinfection, motorised valves, and sludge dewatering equipment. Contact us with your P&ID or equipment list for a consolidated quotation.
Do you supply equipment for STP retrofits and upgrades?
Yes. QuaSys supplies retrofit equipment for existing STP capacity upgrades — MBBR media to upgrade biological capacity, screw press to add sludge dewatering, membrane modules to upgrade to MBR technology, UV to add tertiary disinfection. Contact us with your existing plant details and upgrade requirement.
What is the typical lead time for wastewater equipment supply to India?
Standard stocked items (small dosing pumps, flow meters, motorised valves, UV systems) are dispatched to India within 3–7 working days. Engineered items (custom blower models, large screw presses, MBR membrane cassettes) have 4–12 week lead times. QuaSys provides delivery schedules at the quotation stage.
Can QuaSys provide AMC for all wastewater equipment?
Yes. QuaSys Inc. offers Annual Maintenance Contracts (AMC) covering the complete range of wastewater equipment supplied — blowers, membranes, dosing pumps, UV systems, flow meters, valves, and screw press — for clients. Single AMC, one vendor, one point of contact.
Does QuaSys have experience with ZLD (Zero Liquid Discharge) plant equipment?
Yes. QuaSys supplies equipment for Zero Liquid Discharge plants — UF membranes and MBR membranes for pre-treatment, dosing pumps for antiscalant and chemical dosing, flow meters for mass balance, UV for disinfection, and motorised valves for process control. Contact our technical team for ZLD equipment consultation.
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