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For the preparation of water in public pools traditionally sand filtration is used in combination with additional process steps. This well and long-established technology is outstanding due to small water consumption but exhibits some impairment in terms of filtration efficiency regarding micro-organisms.

Therefore, ultrafiltration with polymer membranes has been increasingly used for a couple of years for pool water preparation purposes. The ultrafiltration membranes provide a physical barrier for bacteria and viruses in the nanometer-scale, thus resulting in a very good water quality. Unfortunately, the use of ultrafiltration systems leads to higher water consumption in many cases, which leads to an undesired increase of the operating costs for the pool operator

CRYSTAR® FT ceramic Membrane Filters for the preparation of pool water in public pools, together with additional process steps, uniquely combine the advantages of small water consumption and high-water quality and represent real and new alternative to the known filtration techniques CRYSTAR® FT Ceramic Membrane Filters for the preparation of pool water in public pools are a further development of Saint-Gobain’s diesel particulate filters, which are used in the automotive business. CRYSTAR® FT Ceramic Membrane Filters for the preparation of pool water in public pools are operated in dead-end mode, which means, the complete pool water has to pass the porous, filtration-active membrane, ensuring that all particles are held back by the membrane.

ADVANTAGES OF CRYSTAR® FT CERAMIC MEMBRANE FILTERS

The use of CRYSTAR® FT Filters ensures the following advantages:

  • physical barrier for bacteria and micro-organisms
  • high efficiency
  • excellent chemical robustness
  • long service time
  • high flux
  • effective disinfection
  • simple cleaning
  • reduced chlorine consumption
  • without pH-restrictions
  • small operating costs
  • compact design

An important advantage of CRYSTAR® FT ceramic Membrane Filters for the preparation of pool water in public pools is their ability to be cleaned even under extreme chemical conditions (e.g. at pH 0.5 and pH 13.5). After such cleaning, the filters are practically in “as delivered”-state, system design supports this, the filters can remain mounted in the system for the chemical cleaning and are ready for filtration immediately afterwards (ClP “Clean in Place”). Due to the outstanding material properties of silicon carbide, the chemical cleaning can be repeated as often as required to ensure a long service time.

CRYSTAR® FT HiFlo

Cross section dimension mm – in 149 x 149  –  5 7/8 x 5 7/8
Cross section dimension mm – in 149 x 149  –  5 7/8 x 5 7/8
Standard lengths * mm – in 1000  –  39 3/8
Channel hydraulic diameter mm – in 1,9 mm – 0,0748 in
Filtration area m² – ft² 11.0 – 118.5
Weight  (without flange) kg – lbs 19 – 42
Chemical composition SiC >99%
Membrane pore size ** μm 4.0
Flux with clean water,
20°C / 68°F at 1 bar / 14.5 psi
LMH – GFD 25000 – 14700
Recommended flow rate for pool water m3/h 14 – 20
Recommended flow rate for pool water gpm 61 – 88
TMP recommended bar – psi up to 0.6 – 8.7 in vacuum mode
up to 1.0 – 14.5 in pressure mode
Backwash recommended bar – psi up to 2.0 – 29.0
pH range pH 0 – 14
Temperature range °C – °F Up to 65°C – 150°F with flange
Up to 500°C – 930°F without flange
Standard lengths * mm – in 1000  –  39 3/8
Channel hydraulic diameter mm – in 1,9 mm  –  0,0748 in
Filtration area m² – ft² 11.0 – 118.5
Weight  (without flange) kg – lbs 19 – 42
Chemical composition SiC >99%
Membrane pore size ** μm 4.0
Flux with clean water,
20°C / 68°F at 1 bar / 14.5 psi
LMH – GFD 25000 – 14700
Recommended flow rate for pool water m3/h 14 – 20
Recommended flow rate for pool water gpm 61 – 88
TMP recommended bar – psi up to 0.6 – 8.7 in vacuum mode
up to 1.0 – 14.5 in pressure mode
Backwash recommended bar – psi up to 2.0 – 29.0
pH range pH 0 – 14
Temperature range °C – °F Up to 65°C – 150°F with flange
Up to 500°C – 930°F without flange

CRYSTAR® FT HiPur

Cross section dimension mm – in 149 x 149  –  5 7/8 x 5 7/8
Cross section dimension mm – in 1000  –  39 3/8
Standard lengths * mm – in 1,9 mm  –  0,0748 in
Channel hydraulic diameter mm – in 11.0 – 118.5
Filtration area m² – ft² 19 – 42
Weight  (without flange) kg – lbs SiC >99%
Chemical composition 0.25
Membrane pore size ** μm 4000 – 2352
Flux with clean water,
20°C / 68°F at 1 bar / 14.5 psi
LMH – GFD 5 – 10
Recommended flow rate for pool water m3/h
gpm
22 – 44
up to 0.6 – 8.7 in vacuum mode
TMP recommended bar – psi up to 1.0 – 14.5 in pressure mode
up to 2.0 – 29.0
Backwash recommended bar – psi 0 – 14
pH range pH Up to 65°C – 150°F with flange
Temperature range °C – °F Up to 500°C – 930°F without flange
149 x 149  –  5 7/8 x 5 7/8
Standard lengths * mm – in 1000  –  39 3/8
Channel hydraulic diameter mm – in 1,9 mm – 0,0748 in
Filtration area m² – ft² 11.0 – 118.5
Weight  (without flange) kg – lbs 19 – 42
Chemical composition SiC >99%
Membrane pore size ** μm 0.25
Flux with clean water,
20°C / 68°F at 1 bar / 14.5 psi
LMH – GFD 4000 – 2352
Recommended flow rate for pool water m3/h
gpm
5 – 10
22 – 44
TMP recommended bar – psi up to 0.6 – 8.7 in vacuum mode
up to 1.0 – 14.5 in pressure mode
Backwash recommended bar – psi up to 2.0 – 29.0
pH range pH 0 – 14
Temperature range °C – °F Up to 65°C – 150°F with flange
Up to 500°C – 930°F without flange