By Nima Kapadia
An enormous recreation center in Flagstaff, Ariz., is taking advantage of the state’s sunny weather to warm two indoor and outdoor body slides, a family whirlpool and a three-lane lap pool: about 100,000 gallons.
The Aquaplex Recreation Center will use a 70-panel solar heating system for its multiple pools in a facility that is larger than 51,000 [...]

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