Sazzi said:
how little effort 99% of pool store visitors are willing to put into their pools.
And here is where pool stores make their money.
I used to care for a decent number of aquariums, or nearly every sort you can imagine. Freshwater, Saltwater, Reef, Planted, you name it.
One of the most valuable lessons I learned was that aquarium maintenance...and, I suspect, "professional" pool maintenance...isn't about water chemistry. It's about user satisfaction.
The doctor who wanted the gorgeous reef tank in his waiting room wanted just that...a gorgeous reef tank in his waiting room.
What he did
not want was:
Something to test
Something to dose
Something to change water in
Something to feed
Something to clean
Something to monitor, watch, manage
He didn't want fish and coral. He wanted artwork.
The lesson that had to be learned, for me anyway, was that neither that doctor nor his staff were going to put in anything more than the absolute bare minimum of effort. They frankly did not CARE why fish died, or algae grew, or water turned cloudy, or any number of other problems occurred. They simply knew when a problem happened, and knew my phone number. "Ugh. Tank bad. Come fix. Now."
Observations at the pool store, and anecdotal evidence here, suggests pools are exactly the same. A great many pool owners don't want a pool. They want a toy to play in. If the toy is broke, they want it fixed.
They are not interested in WHY their water is cloudy, only that it IS...and SOMEONE SHOULD DO SOMETHING.
That "someone" is the pool store. And if it winds up costing $823.78 to "fix" the pool...so be it. That's just one more number to impress the neighbors with at the next dinner party.