How much water will you be using? For small quantity just go buy it, as making small amounts of water and then stopping is hard on the filters. Filter cost depends on the number of stages you have.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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