(1) If the pH of a hot springs pool or spa exceeds a pH of 8.5, a sign must be posted adjacent to the pool or spa notifying users that a pH higher than 8.5 may cause skin irritation and indicating the pH of the water for that date of operation.

(2) Each hot springs pool or spa or flow-through hot springs pool or spa must be maintained to prevent corrosion, algae growth, and other mineral accumulation on the pool wall, floor, and equipment.

(3) Each hot springs pool or spa or flow-through hot springs pool or spa that does not use a chemical disinfectant must be drained, cleaned, and sanitized every 72 hours, along with all surfaces that flow into the pool. Records of the cleaning must be maintained in accordance with the record keeping requirements of these rules.

(4) If the hot springs pool or spa or the flow-through hot springs pool or spa is not chemically disinfected, a sign must be conspicuously posted at pool side that states the following in the same words or words of substantially the same meaning: "State law does not require chemical disinfection of this pool (or spa) if it is completely drained and sanitized every 72 hours. No one with any disease communicable by water is allowed in the pool or spa."