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Another KH question
I have been using RO water to change about 30% every fortnight in my 90
gallon tank. I use Seachem Equilibrium to reconstitute it (which I limit
somewhat because I don't want to raise GH too much), then Seachem Alkaline
Buffer and Acid Buffer to bring the KH and PH to where I want it. I know I
need to get the KH to at least 4 or higher, so I tinker with the buffers
until I reach the right KH and the desired PH of about 6.4 - 6.8. But
invariably when I check the KH several days later it has fallen
considerably, usually to around 2. So I tinker with the buffers once more,
and again the KH will fall. By that time, the two weeks have passed and it
is time to change water again. BTW, I do inject CO2 if that makes any
difference.
I know Tom Barr is going to tell me to lose the RO water. :-)
Nonetheless, I have two questions:
1) Why is the KH falling like this?
2) Is there anything I can do about it (without eliminating RO entirely,
Tom :-) and not tinker so much with the buffers?
Thanks so much!
Neil Anderson