new boat fresh water head clean it eveyweek black mold.what do you do to stop the mold.i drain the bowl every time after the weekend.nasty looking.

Pour a cup of bleach in every week. Reccomended by Vacu-flush.

I send the wife in with a scrub brush

won't the bleach hurt the o ring or seal?

Vacu-Flush reccomends pouring a cup of bleach in the toilet each week. I've been doing it for 11 years, no problems yet.
Or if you can get Bigjims wife to come over and do it, even better!

bleach , and I saran wrap the bowl if I am leaving it for a while , couple weeks etc.