Join Date: Jan 2007
Thanked 0 Times in 0 Posts
Rep Power: 10
Bi carbonate of soda (baking powder) is also used to clean out fresh water tanks.
I've seen that black stuff (usually black mold) formed inside the water inlet pipes even on quite new boats, the transparent inlet pipes and the sloshing water really encourages it. Whereas it's not so keen on the submerged areas. Maybe you can get a long bottle brush to tackle the inlet pipes.