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Sand Filter Question

Hi.  I have a new customer that changed the sand in his filter by himself.  I am sure that he got sand down the center "stand pipe".  The first time that he backwashed, there was probably about 5 pounds of sand pumped out on the lawn.  I don't think

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High Levels of Combined

I am having customers coming in with high levels of Combined.  I treated one customer, 30,000 Free was .66 and total was about 6.5, ph was 8.2, TA was 140, and CYA was around 23.

 

I had him add some Acid to the pool, then shock with roughly 18lb of Ca

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