Just putting this here, as the option comes up in discussion every so often but I don't see a lot of threads about it. They are setting up the machine on Thursday and it will run 3-4 days I reckon.
They don't test for salt, just CH TDS CYA and TA. I told them I just want the CH to come down from 950 to 200. The real reason for the RO is to get the salt level down from 5500, as it's starting to taste bad and our travertine is falling apart.
I could have drained 70% of the pool, but our house softener regenerates every 1100 gallons, so it would take like 8 days to refill the pool.
$325 for pools under 25k gallons. Ekoclear/AuqaLabz here in Phoenix area.
I'll update this weekend.