Sea Era electric
I did change to sea era electric sea water type and I don't use sea water for
flushing but if I was away from fresh water refilling I could and would only if can;t refill with fresh water.
So many ways to flush with fresh water and I choose to hook up a fresh water sprayer like on home kitchens and just hit the button to flush and spray with fresh water as needed,fresh water is so much better and helps keep smells away and the head stays nice and no build up of salt water in hoses and guts of head.
The other real good electric head is the elegance electric model and have heard very good things about it.
nick