Higher Calcium Levels & Stable pH

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Well the pH is holding fine with the following numbers. Small amounts of acid are being inputed into the pool by the PoolPilot Digital input face but the tank seems to have used relatively little acid once the Alk got to 80. The tank is mixed 1 part muriatic to 4 parts water.

Here are the numbers:

Measurement
Measured pH 7.5
Total Alkalinity (ppm CaCO3) 80
Free Chlorine (ppm Cl2) 6.0
Cyanuric Acid (ppm CYA) 35
Calcium Hardness (ppm CaCO3) 400
Total Dissolved Solids (ppm) 3,450
Total Sulfate (ppm SO42-) 0
Total Borate (ppm Boron) 50.0
Total Ammonia (ppm Nitrogen) 0.0
U.S. Gallons 10,000
Temperature (oF) 83

Total Chloride (ppm NaCl) 3019
Carbonate Alkalinity (ppm CaCO3)61.9
Langelier Saturation Index (LSI)-0.09
% HOCl (vs. Total Free Chlorine)1.3%
OCl- (as ppm Cl2) 0.099
HOCl (as ppm Cl2) 0.080
Calcite Saturation Level (CSL) 0.63
Calcite Saturation Index (CSI) -0.20

A pH of 7.5 seems less irritating to the eyes. These seem fairly ideal numbers. One reason the pH holds so well is the pool is covered except from 5pm to 9pm for swimming. If the cover is left off over night the pH rises to 7.55-7.6 according to the digital control, mostly to 7.55