Time. The surveyor said it's best not to drink from them. Any Ideas on what can be done so they are safe to drink from.
I just threw mine out. The internal corrosion was too extensive and the water was terrible. I am told that aluminium can contribute to ashiemers. i have enough memory problems as it is. I have replaced them with soft bladders. Relatively easy to fit and I am told they have very good longevity. There is no taste problems if you use the correct food grade hoses. Good luck
Didn't someone ask this same question in this thread about 2 months ago..?? Seek and ye shall find!!! 
BTW the old aluminium alzheimers link is a factoid 
Poods
