(1) Minimum depth for a swimming pool shall be three feet except in specialized pools or pool entries approved by the department, which include, but are not limited to, the following types of pools or pool entries:

(a) wading pools;

(b) zero entry pools; and

(c) therapy pools.

(2) Maximum water depth at the shallow end of a swimming pool shall not exceed three feet six inches, except in special purpose swimming pools, special instructional pools or restricted or recessed areas of a pool that are separated from the shallow portion of the pool by safety lines attached to the sides of the pool and supported by buoys.

(3) Such specialized pools must be approved by the department. Such pools include but are not limited to:

(a) lap pools not exceeding four feet in depth at the shallow end;

(b) therapy pools; or

(c) instructional pools for scuba diving or for other specialized training.

(4) Use of specialized pools with shallow ends deeper than three feet, six inches, must be restricted to swimmers who have demonstrated their competency to swim in the deep end of a pool.