I'll third the recommendation for the dehumidifier water...if you run a hose from the catch at the bottom of the dehumidifier to the res, it'll auto top off your res for you :wink:. With a sealed setup you can usually go LONG periods without having to buy water. Mine usually runs about 7-8 ppm, but that's better than the RO I have to buy occasionally for res changes which usually runs around 20ppm.
BTW, if anyone ever asks why your buying so much water all you have to do is just tell em you have a salt water aquarium
BTW, if anyone ever asks why your buying so much water all you have to do is just tell em you have a salt water aquarium