Aerator to increase pH

Most just hook up to the return jet and spray the water in the air ... No power required.

Or you could run an air compressor into the water, or run a waterfall, or spa. Anything that gets water exposed to air.

You have a spa, why not run that?
 
I dont know if inground pool returns are made the same as above ground returns. If so you could make this and point it upwards to where is shoots the return water up out of the water. It will aerate that way.
 

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With decent aeration, you should see it move from at least 7.0 to 7.2 in that 4 hour timeframe, but it may take more like a day to get it up to 7.5 or higher. The outgassing is faster at low pH and higher TA as shown in this table that shows the degree of over-carbonation of pool water at various TA and pH levels.
 
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