The Planted Tank Forum - View Single Post - Crushed coral for RO water?
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post #2 of (permalink) Old 06-15-2017, 09:25 PM
feraledgeoutdoor
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crushed coral will buffer the pH and kH by releasing calcium carbonate as it slowly dissolves in the water....putting it the filter will make it work faster. Using crushed coral is certainly a long-term solution as opposed to using baking soda, but will also lose effectiveness as it is used up. Crushed coral in your water which has a kH of 0 would probably only be effective for around 1 - 2 years, when it would need to be added to or replaced.
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