Descaling fresh water tank?

Hi,
I have recently bought my Broadway. Fresh water level showing on control panel as e.g., 75% but when I run the taps the control panel alarms and flashes showing fresh water as 0%
I have emptied and refilled the tank and the level reads about right but the problem above persists.
I took the MH to a Motorhome Service Repairer who said I needed to descale the fresh water tank to resolve this problem as the level sensor in the tank may be scaled up?
Any ideas?  I have heard of descaling a hot water tank/boiler just like you would with a kettle in a hard water area but not heard of this with cold water storage?
Thanks

Quite a few topics on here - the search tool is your friend ;)

Here's one I posted where I treated my tanks with citric acid, which is a nice cheap and non-toxic way to clean your water tanks out.
All the level sensors worked fine afterwards too.

[You must be registered and logged in to see this link.]

Thanks again Noggin!!
So in essence, if I put 500g of Citric Acid in my fresh water tank, leave it sit there for a day or two and then flush it out well, this should sort it out?
Cheers

I dissolved the citric acid in about a gallon of water first and poured into the tanks and then topped up, but yeah, any way of adding the acid to the tank and filling up should suffice.

Can't say 100% it will work as can't be sure why your sensor's aren't working, but if it is indeed down to limescale build up, this should help.

Also depends how much scale has been deposited. It worked for me, but other tanks may need a stronger solution or repeated soaks. It's also getting colder now so the action will slow a little from when I did it in the warmer weather, but for the cost of the citric acid and the ease of doing it, it's worth a shot regardless.

 Thanks again!!

You might find the thread linked below of interest

[You must be registered and logged in to see this link.]

Thanks Peter

Just curious, but how do you get the acid (vinegar?) into the tank in the first place? and also what is the recommended mixture? i.e. dilution rate?

As a suggestion to Noggin's point about the cooler weather slowing the action down, my Warwick Duo has heated tank blankets fitted to both the Fresh and Waste tanks, so I could leave them switched on (on ehu) and this would both warm the water / acid solution and encourage it to circulate round a bit.

I used citric acid, dissolved in a watering can and poured in, then topped up with water.

I wouldn't use vinegar simply because it takes a lot of rinsing to get the smell out.

Citric acid is probably cheaper and doesn't leave a smell etc.

Spospe wrote:Just curious, but how do you get the acid (vinegar?) into the tank in the first place? and also what is the recommended mixture? i.e. dilution rate?

I spoke to Kilrock Products who make several descaling products and they recommended Descalene as a safe and effective descaler for the fresh water system.  I used 2 of 2 dose packs at a cost of £18.94 including postage.

I mixed the solution using warm water in a bucket and using the electric external pump filled the tank and water system components, this required several bucket fulls.  The advice from Kilrock was that there was no benefit in leaving the solution in longer than 20 mins or so but I left in for an hour and then filled and flushed the system twice with clean water

I hope you don't mean this "2 dose" pack, it's less than 2 quid a pack:
[You must be registered and logged in to see this link.]

Yes I do and as you can see from the invoice below I bought direct from Kilrock.

Looking at the invoice it says "Descalene 2 Dose pack x 2 qty 3" - I can't remember what a 2 dose pack x 2 is.  In any event its a lot cheaper from home care essentials!


[You must be registered and logged in to see this link.]

I was just wondering if the one you bought was a larger '2 dose' pack for tanks or something, as the one I looked at is for washing machines/kettles. Can't find a bigger pack though.

How about this 5 dose bottle available from places such as Robert Dyas  and even Aldi have it occasionally..

[You must be registered and logged in to see this link.]


or this from Wilkos...

[You must be registered and logged in to see this link.]

Thanks for all replies, I have ordered some Descalene and will report back and let you know the results when I have used it.

Kilrock descaler available from Aldi again on 29th December.

Was looking at the safety data sheets for this stuff, it's basically just formic acid.

I'll stick with buying citric acid. Is extremely cheap by comparison when you consider how much you can make when dissolving it down, will store better as it's a dry crystal and you can make your solution as concentrated as you want.

Spospe wrote:Thanks for all replies, I have ordered some Descalene and will report back and let you know the results when I have used it.

I bought some Descalene and it worked a treat: see [You must be registered and logged in to see this link.] for the details of how I used it.