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bluehelix · 02-01-06, 16:49

chill, calcium carbonate and hydrated lime are totally different beasts. You certainly cannot use one for the other. It takes about 1.2 cups of garden-lime grade of calcium carbonate to balance out 15 cups of loosely-packed peat moss to a pH of around 7.5. If you end up using the very pure form of calcium carbonate used in wine making, use only 1 cup per 15 cups of peat moss since it's more reactive in my experience.

Calcium hydroxide (hydrated lime) varies in quality so much that one cannot really give very good recommendations of how much to use. The reason is because some forms have a lot more calcium carbonate in them than others. It's strength really depends on how the powder was protected from moisture and fresh air during storage.

02-01-06, 16:49	#3 (permalink)
bluehelix Mycotopiate Join Date: Jul 1972 Posts: 516	chill, calcium carbonate and hydrated lime are totally different beasts. You certainly cannot use one for the other. It takes about 1.2 cups of garden-lime grade of calcium carbonate to balance out 15 cups of loosely-packed peat moss to a pH of around 7.5. If you end up using the very pure form of calcium carbonate used in wine making, use only 1 cup per 15 cups of peat moss since it's more reactive in my experience. Calcium hydroxide (hydrated lime) varies in quality so much that one cannot really give very good recommendations of how much to use. The reason is because some forms have a lot more calcium carbonate in them than others. It's strength really depends on how the powder was protected from moisture and fresh air during storage.