Ohio Rev. Code Ann. § 3749.01
As used in sections 3749.01 to 3749.10 of the Revised Code:
(F) "Private residential swimming pool" means any indoor or outdoor structure, chamber, or tank containing a body of water for swimming, diving, or bathing located at a dwelling housing no more than three families and used exclusively by any of the following:
(3) A paying guest of a resident if the guest is participating in a certified swimming class conducted by the resident, provided that both of the following apply: