I got my RO water for 50 cents a gallon. I've checked several stores and they all sell it for that price. I do not know if that is expensive or not, but for me, that is cheap. I live in the burbs of chicago and my tap water has a 7.4 ph and gh and kh is pretty high. I have tried distilled water but that only dropped the hardness alittle bit. I had started out with 20+ of each kind of shrimp and am down to 2 of the red and 4 of the blacks. So I'm trying RO water. If they start flurishing then I will invest in a RO unit. But for now, I'll get it from the lfs. I have the shrimps in a 10 gal and spending $1.50 - $2.50 a week on water for the tank isn't all that much.
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Eheim Pimp #304
Victor Pimp #21
55gal planted, Eheim 2215,2-65w coralife 6700k cf,flourite w/super naturals tahitian moon sand, EI dosing, Angles, Ottos, Neon Tetras, SAE, Yoyo Loach
35gal high planted, Eheim 2215, 1-96w coralife6700k cf, flourite sand, RCS
2 - 10gal planted shrimp tanks