Yeah, RO systems are expensive. Fortunately, mine came with my house. You might want to steal from a nearby municipal water system. Maybe a friend's house, or a public building's hose. I tried using unfiltered well water, and the hardness was over 300, pH was 8.5, and sulfur in the water turned it yellow in a day. Great for rift valley cichlids, if the sulfur is removed. 
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30g-Krib pair, neons, bamboo shrimp, otos, bristlenose plec, moneywort, elodea, dwarf hairgrass, aponogeton, subulata, java fern, wisteria, red ludwigia, and java moss.
20g-Bolivian ram, cories, mollies, guppies, hornwort |