If this helps, I was using powdered calcium carbonate but was recently
referred to liquid calcium carbonate. It's a lot easier and the results are
pretty instant. I added 5mls to a 200litre tank and the KH went up 1degree
when I tested straight after. It's called PH booster (make sure you get the
calcium carbonate one, not the phosphate one)
Justin.
"jet" wrote in message
oups.com...
I used powdered calcium carbonate. There is no more obvious residue
left in the tank, so hopefully it is as hard as it will get. I expected
to get a higher CO2 levels than this. At 4 KH and 7.4 pH I'm only
getting 4.8 ppm of CO2.
I need to come up with a better way to add the powder at the next water
change. I'm thinking of branching a line off one filter return and
running a very low flow through a bottle DIY reaction chamber with the
calcium carbonate in it. This should eliminate the large swing of
adding the unbuffered powder all at once. It will also give me a bit
more control over the hardness. I can't see going though this bit every
water change as the CO2 tries to catch up with the carbonate.
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