How Often to Drain a Pool in Phoenix, AZ

Why Arizona Is Different

A pool here can lose several feet of water a year to evaporation. What leaves is pure water; every mineral and dissolved solid it was carrying stays in the pool. Then you top up from a hose that is already hard, adding more.

Repeat that cycle for a few years and the water becomes saturated. Chlorine goes in and does almost nothing, calcium hardness reads high whatever you do, and the pool looks dull no matter how it tests. No amount of chemistry fixes water that is already full.

Signs Your Water Is Finished

The symptoms are consistent enough that experienced owners recognise them. If two or three of these describe your pool, it is worth testing dissolved solids rather than buying more chemical.

• Chlorine disappears within a day of dosing
• Water is clear but flat and grey rather than blue
• Scale returns on tile weeks after cleaning
• Swimmers report stinging eyes despite balanced tests
• A salt cell runs at maximum and still cannot keep up

A Realistic Interval

Two to four years suits most Valley pools, with the variation coming down to how heavily the pool is used, how well it has been maintained, and how hard the local supply is. Buckeye and the far West Valley sit at the shorter end. Older Phoenix pools that have never been drained are frequently a decade or more overdue.

Well-maintained, moderate use

Around every three to four years.

Heavy use or very hard supply

Closer to every two years.

Salt pool

Similar interval, but watch dissolved solids more closely.

Never drained

Test now — this describes a surprising number of Phoenix pools.

Draining Safely in This Climate

An empty pool in Arizona is not a neutral state. Sun on bare plaster can crack it, and in areas with high groundwater a pool shell can genuinely lift out of the ground if the hydrostatic relief valve is not handled correctly. This is the main reason we would rather do it than have you attempt it on a hot weekend.