
The thin white tube feeds topoff water from the basement.

Return pump is an Iwaki MD-30. The smaller Iwaki pumps are quiet (no fan), cool, and use relatively low energy. You can see the Sunbrite timer pack under the tank as well.

Topoff water comes from an old 15 gallon tank sitting on an use d aquarium stand. I manually fill the tank every week or so with RO; it's mixed with a Sodium carbonate and/or sodium bicarbonate to maintain the tank's alkalinity and PH. A SpectraPure "Liter Meter" doses the water upstairs to the sump.

Finally, the RO system. An electronic valve (upper left) is turned on for 2 hours daily by a timer (at right). The valve feeds water to the RO system (middle left), which flows to the Rubbermaid container. This water is used for making up water for topoff and weekly changes.
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