Thank you for reaching out to us.
A tidal pool is often acceptable for immersion depending on the specific conditions: safety, privacy, size, and depth. If this is a natural tidal pool, where all the water is seawater that comes in naturally (without pumping) during high tide, and it is deep enough for comfortable immersion, then it should be acceptable. Learn more about immersion in natural bodies of water
here.
Under the circumstances, you can immerse during the
eighth day in daytime, with your husband's
supervision, in a loose t-shirt or robe. A bathing suit would be a
chatzitzah. (You could wear a bathing suit under your shirt and remove it under the water. It would probably be easiest to wear a bathing suit without the shoulder straps, or just swim shorts.)
If another Jewish female over age twelve is available, it would be preferable for her to observe the immersion rather than your husband.
Mikveh immersion on day six is not valid, so working out immersion in a natural body of water like a tidal pool would be your best option.
We hope this helps. Please don't hesitate to follow up with us.
