Hi there guys...
As a plumber in the boat industry, I have come across a few cases where owners have used copper tubing with solder fittings. It works untill the solder fittings and pipe are so curroded that the whole system must be replaced. Remember that salt water
conditions are no friend of copper nor solder. Go for grp with a good epoxy paint
inside ( the epoxy
taste will stay in the water
for quite a long time) or the best but expencive option, stainless steel
. Also have a look at the VETUS range of tanks, it comes in various sizes plus fittings, www.vetus.com