best product to clean boat fresh water tank (not been used)

[Mexican cuties]

just checking the boat for wintering, (on river thames), started to run the taps to drain the cold water tank (which we dont use to be honest) and what a lovely smell not!! - can see numerous products on the web, any one have any recomendations of what to put in, flush, then flush again

many thanks

[swanny71]

Ideally you’d super-chlorinate the tank(s) and the whole system.

https://www.shipsan.co.uk/potable-water-products/p...

Basically a water & bleach solution would work - just take sensible ventilation and PPE precautions.

Edited by swanny71 on Monday 23 October 18:24

[Simpo Two]

How can you not use the water? I was on my boat last weekend (3 people, 3 days) and we emptied the water tanks twice!

If you don't use the water tank I'd leave it empty.

Milton fluid?

[Decky_Q]

I used the chlorine tablets for brewing beer. They're very cheap, can be ordered online and you can be sure it's safe to drink after flushing.

[chopper602]

A lot of motorhomers swear by this product - https://www.amazon.co.uk/Clean-Tabs-040569-Cleaner...

Although I use this, as it's a liquid and easier to mix https://www.prokleen.co.uk/pro-kleen-caravan-fresh...

Be careful if the same water tank supplies a water heater, as bleaches like Milton can cause damage to stainless steel boiler tanks