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oyster shells in filter to stabilse ph

Subject: oyster shells in filter to stabilse ph
by ianbo on 14/2/2013 19:33:42

I normally use pH buffer,however I have been led to believe that crushed oyster shells in the filter can hold the pH to 7.5.where I live rainfall keeps diluting Ph to a more acidic level.

I have some additive that looks like coral/shells that I bought a while ago and I thought I would try it .I normally buffer up at 7 pH to 7.5 but I feel it would be better not to have to so often.

Has anyone any experience of using this alternative to buffering.