Baphijmm Posted April 23, 2022 Share Posted April 23, 2022 Tested the water in the Rio Negro tank this afternoon; it's been rather overdue, but as I'd expected, nitrites and nitrates are all quite good, near-perfectly balanced (zero nitrites, near-zero nitrates). pH is perfect (maybe a *little* high for the planned stock of the tank, but still pretty neutral around 6.8-7.0; once I can begin introducing tannin botanicals again, that should drop a little, so 👍). The one item that raised my eyebrows slightly was the GH; I expected it to be high for reasons I'll explain, but at >300 ppm, we've got a problem. I need to lower that. This is absolutely a result of the water here; we're using well water (pros include no chlorine, cons include... well, this), and even though I fill this tank exclusively from an RO system, the calcium in this water is so thoroughly concentrated and suspended in solution, that's not nearly enough. High GH is a common problem throughout this state--you may have heard of "caliche", deposits of calcium carbonate that are extremely prevalent in the American southwest. (Ironically, in spite of this, the KH of the tank is actually quite low, ~20 ppm. Probably the RO system taking care of that, since carbonate is a much larger molecule.) One might think the abundance of bladder snails in this tank might have something to do with it, but if anything that's just another symptom; there's enough calcium in the tank to support the likely literally hundreds of the little blighters in there. So, my question is, how do I begin working toward lowering this GH? Hard mode: Since I already exclusively use RO water from our RO system, "changing water with RO water" likely isn't going to be a good solution. (Unless I feel like buying hundreds of gallons of RODI from the store every month.) Is there anything... This is almost certainly a stupid question, but while I did ace freshman chemistry, I am absolutely not a chemist: Is there anything that might, for example, bind to the calcium ions in the water and... precipitate them out, or get them into big enough chunks that a water polisher might be able to just remove them? Thoughts? Link to comment Share on other sites More sharing options...
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