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Old May 9, 2018   #6
zipcode
Tomatovillian™
 
Join Date: Jun 2010
Location: Romania/Germany , z 4-6
Posts: 1,582
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5 years would be a good figure. I'm on my 8th but I think I stretched it a bit (mostly due to pH change due to extremely hard water). New mix is hella expensive to change every year, and not really necessary.

Last edited by zipcode; May 9, 2018 at 04:08 AM.
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