Inground pool is pitting..

[PoolDoc]

Pitting goes around entire perimeter of pool. 30k gal kidney shape. Filter runs 8 -10 hrs / day.

Waterbear posted while your post was in moderation, where he couldn't see it. However, it's a worthwhile point: if you use floaters AND don't run your pump continuously, that might explain why the pitting is localized to the pool perimeter, rather than being uniform.

[CarlD]

I'm not the concrete pool guy but having been around here for a few years now, it seems that most hard-side pool owners need to have their hard-liner resurfaced about every 5 years. You've gone 20 so that's pretty good.

Carl

[PoolDoc]

Thread closed -- OP is an iPhone 'app developer' who spam-vertising his pool app for iPHones.