The General Guideline
Most Arizona pools benefit from professional pool tile calcium removal every 12–24 months. Pools with unusually hard fill water, heavy usage, or no prior sealant application tend to fall toward the more frequent end of that range.
Factors That Shorten the Interval
Frequent water top-offs (common with heavily used pools or those without covers), skipping calcium hardness testing, and tile that's never been sealed after a prior cleaning all accelerate how quickly new scale becomes visible.
Factors That Extend the Interval
Regular use of a pool cover to reduce evaporation, consistent calcium hardness and pH monitoring, and a protective sealant applied after each professional cleaning can meaningfully stretch the time between visits toward the 24-month mark or beyond.