Posted 3/6/2017 12:57 PM (GMT -6)
I use a Sure Seal (www.alpglobal.com) over my wafer and I swim all summer and shower daily. Sure Seals are waterproof and breathable and hold up amazingly well to moisture. My normal change schedule is once a week and I can attribute that to using them.
I also put a small piece over my charcoal filter so it doesn't leak.
You can order samples from their website, too, to see if you like them. Just keep in mind that they take a few tries to get the hang of them!