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Author Topic: Green slim in my hot water tank?  (Read 3369 times)
Other-Power
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« on: May 16, 2013, 09:56:24 PM »

Hello all,

I dropped the water out of my hot water tank in preperation to move it to the loft.

Once I dropped 95% of the water I moved the tank and could hear a lump sloshing about.  I dropped the remainder of the water out into a bucket and there was a fair bit of slimy green glue in it.  This was in the direct part of the tank, ie the hot water itself.

I live in Cornwall and scale is not a problem in my house or any other I have been in.

The primary coil is heated from a wood burner if that helps?

Any ideas what it is, what it points to and is it a problem?

Thanks

Jon
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camillitech
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« Reply #1 on: May 17, 2013, 06:00:27 AM »

I have no idea Jon but I'd love to know as I found a similar one once in a house that I once stayed in, it was like a green slimy alien  Undecided
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derekmt
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« Reply #2 on: May 17, 2013, 08:23:46 AM »


 Copper hydroxide and copper carbonate. This is corrosion caused in soft water. see http://www.fwr.org/copper.pdf. Check to see if you have an aluminium protection rod
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Other-Power
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« Reply #3 on: May 17, 2013, 12:04:30 PM »

There is a sticker on the insulation that says Anode, would it be under the insulation?

I assume it can be replaced?

Cheers

Jon
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derekmt
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« Reply #4 on: May 17, 2013, 12:46:42 PM »

There is a sticker on the insulation that says Anode, would it be under the insulation?

I assume it can be replaced?

Cheers

Jon

Dont know , but  green slime means your tank and pipe work is disolving... Probably something needs to be done...
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Other-Power
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« Reply #5 on: May 17, 2013, 04:17:52 PM »

I think I will get some instant heaters and be done with the tank.

Thanks for the help!

Jon
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skyewright
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« Reply #6 on: May 17, 2013, 06:16:26 PM »

There is a sticker on the insulation that says Anode, would it be under the insulation?

I assume it can be replaced?
I have a feeling that tanks with anodes are supposed to have them checked annually?

AIUI the anode is more fully known as a sacrificial anode & it will gradually get used up. Once its been used up, the bits it was sacrificing itself to protect are next in line. Hence the green goo?
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« Reply #7 on: May 17, 2013, 07:26:51 PM »

There is a sticker on the insulation that says Anode, would it be under the insulation?

I assume it can be replaced?

Cheers

Jon

These anodes are magnesium and they do usually screw into a boss, a bit like an immersion. The slime could well be a complex magnesium hydroxide/carbonate stained green with the dissolved copper ions. As others have said once your anode is gone the cylinder starts to dissolve, usually anode last 5-6 years ish before getting radically pitted and smaller, is yours much older than this? Anodes can be bought for about 15 quid, it sounds like you need to check this fairly urgently to me.

pet as Deer
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Other-Power
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« Reply #8 on: May 17, 2013, 09:18:54 PM »

Ok, well I think I am leaning towards fitting instant water heaters as my demand is so low, moving the tank from downstairs as it takes up alot of very usable space from the bathroom.

Is it worth selling it second hand or only as scrap?

Thanks

Jon
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