Join Date: Jun 2014
Location: Cape Coral, Florida
As a general way of thinking, 75 gpd means about 3 gallons per hour. That's a pretty decent speed actually, and what I use to handle water changes in a 220G and a 45G tank.
What I did was buy a trash can (nice big rubbermaid) and let it fill overnight or during the day. I then mix the remineralization chemicals in that also, and if necessary warm or cool the water to match the tank. These last steps are important, you don't want to go from RO to tank directly.
Then I have a little dolly (about $20 at Harbor Freight) and roll the trash can over to the tank and use a pump to transfer the water. For smaller water changes a pail works equally well.
But when I'm doing a water change (usually a total of about 120 gallons), I just leave it making water the whole time, I pull off about 35G for the 45G tank (I do infrequent, heavy changes there), and then fill two trash cans to about 45G each for the 220G tank. Takes about two days of running the filter, then I put it back up for a month.
But don't forget you need to mix chemicals (always), and probably warm/cool the water before the water change. You should also aerate (but that generally comes with mixing). I find a pond pump works great, no tubing or anything, just chuck it in the bottom of the trash can and let it run, it mixes the chemicals and causes enough water surface agitation to aerate the water.
Latest tank build:
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