supermarkets sell RO water, some have bottled water, others have the actual filler, so you can fill your old bottles. But you never know how old the filters in the machine are.
Personally, the amount you pay for the bottles or filling your own would pay for your filtration unit in no time. Then you don't have to worry about buying it, just make as needed.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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