Hi Mark, About 10 grams will raise 20 gallons of water 4* GH. Its best to use a scale if you can.
orlando · Registered Joined Feb 14, 2007 · 1,614 Posts #2 · Oct 28, 2008 View full thread Hi Mark, About 10 grams will raise 20 gallons of water 4* GH. Its best to use a scale if you can.