I've never seen a boat with metal plumbing. We use AGM as well and
avoid the battery water probem. Liquid electrolyte battery are obsolete
IMHO.

Doug

"Leanne" wrote in message
...

" * I use AGM batteries, and drink the water.

We do too, but remember that water will rust your plumbing.
Though is great for cooking, washing, or brushing teeth.

Leanne
S/V Fundy