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FRP Pressure Filters

FRP pressure filters are closed cylindrical vessels designed to hold granular filter media (sand, anthracite, activated carbon, etc.) under pressure for water treatment. Constructed of fiberglass reinforced polyester or vinylester, they combine strength with corrosion resistance. These filters operate similarly to steel pressure sand filters but weigh much less. Typically outfitted with top-mounted manifold/distributors and bottom nozzles, FRP filters treat water in municipal and industrial applications. They provide efficient mechanical and biological filtration with very low maintenance.

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Key Features

Fiberglass Construction: Thick FRP laminate with corrosion-resistant interior lining (often PE).
UV-Stable Finish: External gelcoat protects against sunlight for outdoor use.
Multiple Flow Configurations: Gravity or pump-fed, configurable inlet/outlet ports.
Variety of Sizes: Diameters from ~150 mm (6″) up to >1500 mm (60″) and capacities from ~10 L to >3000 L.
Pressure Rating: Commonly 1–10 bar (15–150 psi) for media bed pressure.
High Quality Filtration: Engineered for low head loss and uniform flow.
Factory Test: 100% hydrostatic or pneumatic pressure tested before shipping.

Benefits

Corrosion-Free: No rust or metal contamination, even with chlorinated or acidic waters.
Energy Efficient: Lightweight design reduces pumping energy and installation costs.
Low Maintenance: No protective paint needed; interior smoothness eases media cleaning.
Durable: Chemical-resistant FRP resists acids/bases and does not fatigue easily.
Flexibility: Can be specified as open top, flanged top, or with multiple nozzles.

Applications

Municipal water filtration (sand filters, activated carbon filters).
Swimming pool filtration vessels.
Industrial water softeners and filters (deiron, dechlorination).
Aquaculture water treatment systems.
Pre-RO filtration, wastewater polishing (as tertiary filters).

Technical Specifications

Materials: FRP shell with polyethylene or polypropylene internals.
Sizes: 250 mm to 1600 mm diameter; heights 600 mm to 3000+ mm.
Media Depth: Up to 1000+ mm of sand/anthracite.
Operating Temp: Typically up to 60°C (varies by resin).
Standards: Often built to DIN/EN 13823 or client specifications.

Unique Selling Points (USPs)

Proven Longevity: FRP vessels last decades with minimal upkeep.
Energy Savings: Their efficient design makes them among the most energy-friendly filtration options.
Versatile Configurations: Available in single or multi-bed arrangements, tailor-made for each flow rate.
Quality Assurance: Each tank is fully inspected, giving confidence in leak-free operation.
Non-Intrusive Solution: Unlike concrete basins, they require minimal civil work.