also, is he adding kalk to his top off water? if he is remove it as well and top off manually, the kalk would be stored in a reactor of some sort or mixed in a top off container.
i know this is all complicated if you are not familiar with it but you must find the reason for the high PH or it will go back up overnight.
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Crap happens, that's why they sell toilet paper in 48 roll packs!
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