GrowFAQ:
Will a slow sand/rockwool filter change the pH of my system?
Added by: Cobber
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No. A slow sand/rockwool filter will not change the pH of your system if you used an inert media for construction.
Last modified: 00:21 - Mar 04, 2001
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faq:954 "Will a slow sand/rockwool filter change the pH of my system?"