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Scaly deposit in water tank

We have an aluminium water tank on our 2005 Sea Otter which has hard white deposits that block the pump filter. The tank is inaccessible and we've flushed it through with copious amounts of water. The problem hasn't gone away. Do you have any ideas to solve the problem? Do you know of a chemical that wouldn't make the problem worse considering it's an aluminium tank? Removal of the tank would be difficult and costly. Any suggestions gratefully received. Thanks for your time.

Asked by: Claire Scholes   | 11.20am, Sunday 7 July


WW says:

Eleanor Fresh water tank clean is probably one of the safer treatment agent- it both gentle descales in disinfects the system. Needs to be left overnight and then flushed through- but has worked well on other systems and I believe it is safe on aluminium. You could use citric acid or malic acid to rescale, but working out the right concentration can be challenging, without being too concentrated and damaging the aluminium oxide later that protects the aluminium of the tank.

Mark Langley  | 3.34PM, Sunday 7 July

Elsan not Eleanor! Apologies!

Mark Langley  | 3.34PM, Sunday 7 July

Alas the tank will be integral in the sea otter as it's an aluminium boat... which poses issues if the oxide layer had shredded, as local reoxidation does weaken the metal- especially around welds.

Mark Langley  | 8.00PM, Friday 12 July


Readers say:

Alas, I fear the replies may not help as the white scaly substance may be aluminium Oxide, the 'soft' type. Aluminium can be prone to this when subjected to water when the hard Oxide layer is damaged or breaks down.
I'd seek specialist advice from the tank manufacturer.
Best of luck!
PS, I'd be interested in what they have to say!

Simon Poulter   | 11.07PM, Thursday 11 July

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