I also think running the RO/DI too frequently is hard on the filters. I had to change my DI filter almost monthly! I now fill a 50 gal aquarium sitting above my sump weekly and use a Tunze Universal Osmolator Automatic Water Top-Off system. I know osmolator is $200, but one of my best purchases.
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300 gal starphire custom built in pentagon reef (+90 gal sump on Blue Line 100 HD return pump, 210lb LR, Euro-Reef RC250 skimmer, 2x400W MH, 2x28W compacts, 2xTurbelle classic 4002 pumps & Turbelle Stream 6100 on 7095 Multicontroller, running ZEOvit)
Livestock
Fish: damsels; sailfin, yellow, regal & naso tangs; ocellaris & tomato clowns; lyretail anthias; foxface lo; flame angelfish
corals: a few
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