Garagebrian,
by seltzer water do you mean carbonated or plain fizzy water.
Here in the UK the only seltzer I have heard of is alka-seltzer, I use it ofter after a friday night
:D :D
Given any sized tank and sump.What is the ratio of recirculated water through the sump to that provided in the tank by for example power heads.
I am trying to calc volumes and come up with the appropriate main pump and power head for my tank.
I plant to have a mixed tank with SPS and a few fish...
Keep adding the Kalk to the RO water until there is a little sediment left in the bottom. Let the liquid stand then draw off the clear(er) liquid and drip over night (keep up ph). Try to keep the liquid sealed as it "goes off by contact with carbon dioxide in the atmosphere.
Regards