#11
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Quote:
I think the take away was that 1 30% change a month removes 30% of nitrates (for example), and an infinite number of infinitely small changes that equal the same 30% over a month would reduce it by just under 26%. So you do lose 4% efficiency by continual water changes, but gain consistency and possible ease of maintenance. You also lose the siphoning of the sand to remove gunk, but you can always do an extra change just for that.
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Ian |