The filter captures suspended particles as water circulates through the treatment system. Filtration works alongside disinfection, water chemistry control, and monitoring to maintain the required pool water quality.
Sand filtration is an established technology used in commercial pools. A sand filter contains a bed of granular media through which pool water flows. Depending on the system design, pressure or gravity moves the water through the bed, where suspended particles are captured.
The filter vessel and its internal components distribute water across the media bed. As water passes through, particles are retained within the bed, while filtered water continues through the treatment circuit. Performance depends on media selection, filtration rate, water quality, and any coagulation or flocculation used. As retained material accumulates, resistance to flow increases. Backwashing reverses the flow through the bed to remove accumulated material and discharge it to waste. The filter then returns to service. Sand filtration can be suitable for a range of pool facilities, but selection should account for the required capacity, cleaning arrangements, available plant room space, and ongoing maintenance. The following five aspects are important when comparing filtration options.
Filtration – Sand filters capture suspended particles within the media bed. Their performance varies with the media, filtration rate, and treatment conditions. Filtration does not replace the need for appropriate disinfection.
Cleaning – Backwashing removes material accumulated within the bed. Water demand depends on backwash flow, cycle duration, and frequency. Further cleaning may be needed where fouling affects performance.
Chemicals – Coagulation or flocculation may be used to improve particle capture. Disinfection and pH control remain necessary and should follow the facility’s operating requirements.
Footprint – Allow space for filter vessels, valves, pipework, and maintenance access. The total plant room requirement depends on capacity and the chosen layout.
Lifetime – Inspect the media, vessels, and internal components according to manufacturer guidance. Media replacement should reflect its condition and performance rather than a universal replacement interval.
A ceramic membrane filtration system contains membrane elements installed within housings. LiqTech QlariFlow™ uses silicon carbide membranes, combining a durable ceramic material with a compact, modular system design. Learn more about ceramic membranes. During operation, pressure drives circulating pool water through the porous membrane walls. Suspended particles are retained according to the membrane’s filtration characteristics, while filtered water is collected and returned to the treatment circuit. As particles and organic matter accumulate on the membrane surfaces, cleaning is needed to maintain performance. Automated backwashing dislodges accumulated material, while periodic cleaning in place, or CIP, addresses fouling that backwashing alone cannot remove. Cleaning frequency depends on operating conditions and water quality. Efficient filtration can help reduce operating resource requirements, but disinfection and water chemistry control remain necessary. The same five aspects below show what operators should consider when assessing a ceramic membrane system for their facility.
Filtration – Ceramic membranes provide a physical barrier for suspended particles and support consistent water clarity. Removal of specific microorganisms depends on the selected membrane specification and validated performance. It should not be assumed from the filtration technology alone.
Cleaning – Automated backwashing and periodic CIP maintain membrane performance. QlariFlow can reduce backwash water consumption compared with conventional media filtration, depending on cleaning frequency, cycle settings, and the existing installation.
Chemicals – Effective particle removal can help reduce chemical consumption as part of the overall pool treatment process. Actual chemical demand depends on pool usage, water quality, and operation. Required disinfection levels must still be maintained.
Footprint – QlariFlow’s compact, modular design offers flexibility where plant room space and access are restricted. Compare layouts at the same required capacity, including pipework and service clearances. Installation access must be checked for the selected system configuration.
Lifetime – Silicon carbide membranes are resistant to heat and cleaning chemicals and designed for repeated cleaning. Their service life depends on water quality, operating conditions, and maintenance. Other system components also require inspection and servicing.
Ceramic membrane filtration can support consistent water quality and efficient operation, with performance and operating costs assessed for each installation.
| Automated operation | + | V | V | V |
| Potential backwash water savings | +* | V | V | V |
| Potential chemical savings | +* | V | V | V |
| Validated microorganism removal | S | S | S | S |
| Compact installation potential | +* | V | V | V |
| Dead-end filtration configuration | + | V | V | V |
| No granular or powder filter media | + | V | No | V |
| Suspended particle removal | + | + | + | + |
| Specified particle separation performance | S | S | S | S |
| Remote monitoring | + | V | V | V |
| Access through existing doorways | V | V | V | V |
| Installation requirements | V | V | V | V |
| Integrated electrical and control cabinet | + | V | V | V |
| Temperature monitoring | + | V | V | V |
| Flow monitoring | + | V | V | V |
| Pressure and differential pressure monitoring | + | V | V | V |
Ceramic refers to QlariFlow. + indicates an included feature; V means configuration-dependent; S means consult product-specific performance data.
*Savings and space benefits depend on the installation and comparison with conventional media filtration.
Illustrated sand filter layout with vessels, valves, and pipework. Required floor area depends on capacity, equipment dimensions, and maintenance access.
Illustrated ceramic membrane layout. The selected capacity, configuration, and service clearances determine its final footprint.
