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Fish Tank Supplies > Fish Tank Water Purification > RO/DI Water Filters

Reverse Osmosis Filters, Deionizers & Aquarium Tap Water Filters



Reverse osmosis filters, deionizers, combination RO/DI units & other tap water filters purify tap water for drinking and aquarium use (avoid distilled water). These filters soften hard water for lowered pH without additives, and they remove contaminants - you won't need chlorine removers or water conditioners. If you're concerned about water quality, reverse osmosis systems, deionizers and other tap water filters clear it up from the start! Scroll down to see all.

You will need proper aeration, vitamins & supplements and/or salt to replace oxygen and trace elements removed by purification - but you should be using all that anyway!

Shop by Type

Reverse Osmosis Filters





Water Deionizers





Reverse Osmosis & Deionizer Parts & Accessories




Shop by Featured Products

Tap Water Filter (Aquarium Pharmaceuticals)
Regular Price: $35.64




Tap Water Purifier Replace Cartridge
Regular Price: $20.88





Regular Price: $49.99




HM Digital DM-1 Dual TDS Meter (Spectrapure)
Regular Price: $29.99




Marine Pro RO/DI System - 100 GPD (Spectrapure)
Regular Price: $219.99




Marine Pro RO/DI System - 200 GPD (Spectrapure)
Regular Price: $289.99




Marine Pro RO System - 100 GPD (Spectrapure)
Regular Price: $149.99




Marine Pro RO System - 200 GPD (Spectrapure)
Regular Price: $199.99




MaxPure RO/DI System - 60 GPD (Spectrapure)
Regular Price: $199.99




MaxPure RO/DI System - 90 GPD (Spectrapure)
Regular Price: $218.99




MaxPure RO System - 90 GPD (Spectrapure)
Regular Price: $148.99




MaxPure RO System - 60 GPD (Spectrapure)
Regular Price: $138.99




MAXCAP RO/DI System - 90 GPD (Spectrapure)
Regular Price: $328.99




Pure-Flo II RO Unit - 24 GPD TFC - 2 Canister(ESU)
Regular Price: $110.45




Pure-Flo II RO Unit - 50 GPD TFC - 2 Canister(ESU)
Regular Price: $129.99




Pure-Flo II RO Unit - 50 GPD TFC - 3 Canister(ESU)
Regular Price: $142.03




Pure-Flo II RO with Pump - 50 gpd - TFC - 3 Canister (ESU)
Regular Price: $254.99




Pure-Flo II RO w/Pump-100 GPD TFC-3 Canister (ESU)
Regular Price: $279.99





Regular Price: $179.99




TFC RO Filter 24 GPD (Kent)
Regular Price: $169.99




Max 24 Maxxima RO DI 24gpd (Kent)
Regular Price: $239.99




Max 50 Maxxima RO DI 50gpd (Kent)
Regular Price: $278.99




HI-S Maxxima 60gpd Clear Canister (Kent)
Regular Price: $279.99




HI-S Maxxima RO 35 gpd (Kent)
Regular Price: $239.99




Kold Ster-II Fin-L-Filter System (Poly Bio)
Regular Price: $299.99




Add-On Deionization
Regular Price: $73.99




High Silicate Removal Deion Cartridge (Kent)
Regular Price: $39.99




Pure-Flo II Add-On Deionization Canister (ESU)
Regular Price: $39.99



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