How acidic or basic the water is. You want it in the middle of these two. "PH" refers to the acid/base continuum. Low numbers mean higher acid concentrations, High numbers mean higher alkaline (base) numbers.
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I suppose you mean a round pool. You would also have to know the depth of the pool.
The mean, or the average.
If by pH you mean the acidity of a compound then by combining equal amounts of each pH they would all "cancel each other out" i.e. neutralise which leaves a pH of 7
That's the definition of the "mean" or "average" of that group of terms.