The output line from my RO/DI goes directly to a float in the sump. It also splits into a 5 gallon reservoir. I had to drill one hole in the ceiling and one in the wall to get the line through, which I realize is not an option for everyone, but the advantage is I have a continous supply of top-up water. I check my TDS faithfully to ensure water quality.
HTH 
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Katrina
90 Gal AGA with 2-250W 10k AB DE MH, 220W VHO, Turboflotor 1000, GEO calcium reactor, Pacific Coast chiller, DIY phosphate reactor and nilsen kalk reactor, sps, clams, zoanthids, rose BTA, ocellaris clown, 2 green mandarins, royal gramma, purple tang, sargassum trigger, flame hawkfish, coral beauty, neon dottyback, purple and blue linckia star, brittlestars, snails, snails, snails
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