Since you only change roughly 100 gallons per year I'd personally recommend just using filtered water from a grocery store if it's available. Generally you can get refill water for about $.30-$.40 per gallon and keep it in the gallon jug containers. that would only be less that $30 per year for you seeing as how you'd want to mix the filtered water with tap water to get buffering capacity and some mineral hardness to the water. I'm not sure it's even necessary for you to have to buy filtered water let alone spend $75+ on an
RO/
DI unit. What are you keeping that you think you need special water?
FWIW the Brita filters and similar ones are capable of filtering 40-50 gallons of tap water and would still be less expensive for you than getting an
RO unit if you wanted something available at home instead of having to refill at the store when you buy groceries. Generally
RO/
DI units are for people that change LOTS of water and people that are breeding. I change out about as much water in 2 weeks as you do in a year and I don't have an
RO/
DI setup. I keep discus/angelfish/red cherry shrimp in my water with a pH of 8.0,
KH of 300
ppm, and
GH of 300
ppm with no problems. My RCS colony is THRIVING and my angels look like they are going to breed in it too!
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