Re: Problem with Seachem Equilibrium
This logic seems very flawed to me. I don't doubt your test results (LaMotte kits are very good) but to me it is apparent *something* else is going on.
Here's what I mean...
Say you start a tank and fill it with RO water, then use Equilibrium to raise GH. If you raise GH to 6 dGH using Equilibrium, your K will end up being around 80.
Now let's say you do a water change. You take 40% of the old water out, then replace with new water. If you reconstitute the new water with Equilibrium to 6 dGH / 80 ppm K, then add this back to the tank, the tank water will STILL be 6 dGH / 80 ppm K.
Again I am not doubting your test results... but your K raising drastically after only two or three water changes just doesn't sound plausible unless there is some other factor(s) involved.
Besides, if you raise GH to 6 dGH with Equilibrium you are already off the scope of the LaMotte test kit.
I do agree however that the user should have control over K dosing... ideally it should be 20 ppm. There are numerous reports (note that this is basically conjecture, I haven't read anything scientific) that increasing K to VERY high amounts (several hundred ppm) in water that has >20 ppm of CO2 can cause "calcium uptake" problems... probably referring to the weakening of established plant leaves. Anyway, if I want to raise my GH to say 10 dGH but have my K between 20-30 ppm, this is not possible with Equilibrium. Personally I use Greg Watson ferts to raise GH (CaCl2 and MgSO4) and K (K2SO4), but would rather use Equilibrium, if only it didn't contain all that K!! :)