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i have a bucket in bucket top feed system. it's on continuous feed from top feed omitters. the ph meter has been calibrated uevery other day. i ph my system to 5.8 and in the morning the ph is at 5.5. my experience has always seen the ph go up when the water is sitting and bubbling. i want to know whats going on and if i should be phing my rez to 6.1-6.2 and reset ph when it goes to 5.8.