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I have been doing everything exactly the same prior to this comparison ie 10% water change and daily siphoning of my 1st few chambers (and feeding 8-9x/day). The incoming water source has a stable nitrate level of about 12.5ppm.The increase in flow rate is about 5 tons/hour and as I have mentioned before, mine is a 4-tier BS. I will be away for the next few days and will leave the filters alone until I come back on Sunday. Lets see what happens after that.
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