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#1
06-19-2007, 09:16 PM
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RO/DI question?
QUESTION: Has anyone noticed a high TDS reading as soon as they turn on their RO/DI units?
I recently noticed my in-line TDS reads 500-1500ppm for a few minutes as soon as my RO/DI turns on! It does gradually drop to 001 ppm after only a couple of minutes. I have the unit connected to an Oceanus Triton top-off controller. Because my RO/DI runs in short bursts, I think my top-off water has been poor. When I actually tested my 55 gal top-off tank with a hand held meter, it had a TDS of 445 ppm  . This sucks as the local water yesterday was 145 ppm. I thought I was using good water. This may explain my recent algae problem.Has anyone else noticed such high initial TDS readings from their systems? Does anyone flush or discard their initial water before collecting it? System: Maxxima Hi-S RO/DI Filter. I recently added a second Hi-S RO unit (120 GPD). All my filters are less than 6 months old. I flush the unit weekly.
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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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#2
06-19-2007, 11:53 PM
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It's a known issue but for the life of me I can't remember the term for it.
I don't have an auto top off device, but when I make water for my 5g top off bucket, I hook the system up, let it run for 10-15 minutes, dump that water and then keep the stuff after that.
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#3
06-20-2007, 04:48 AM
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I've seen it posted before that there's a TDS rise (TDS creep) with ro/di and auto-topoff.
I've got a float valve hooked to my Aquasafe unit and have tested many times the first couple of ounces (just enough so my meter reads) but never seen it.
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