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Why does my home made compost fizz when I wet it?

B3B3 Posts: 21,435
When I water the pots,there's a fizzy froth on the top which disappears almost immediately. Our water is fairly hard and there's nothing strange in the compost that I'm aware of.
In London. Keen but lazy.

Posts

  • PurpleRosePurpleRose North YorkshirePosts: 538
    Hi

    I am not sure what it is. We live in a hard water area too. When I water pots which are topped by compost. Any compost, I get a white fizz appear then disappears as the water soaks in.

    I thought that it was normal as I have always noticed it
  • B3B3 Posts: 21,435
    I only notice it with my own. I wonder if it's something to do with acidity.
    In London. Keen but lazy.
  • B3B3 Posts: 21,435
    Still wondering. Google hasn't a clue😊
    In London. Keen but lazy.
  • wild edgeswild edges The north west of south east WalesPosts: 7,490
    Have you tested the PH of your compost? My suspicion would be that your water contains calcium carbonate or similar and the acid in the soil is reacting to create carbon dioxide. If I remember my GCSE chemistry correctly acid plus salt creates carbon dioxide plus water.
    A great library has something in it to offend everybody.
  • B3B3 Posts: 21,435
    I wondered if that was what's going on.   Although my soil is mildly acidic, i cant grow rhododendrons or the like.  It definitely looks like a chemical reaction, but I'm surprised it's so spectacular. If I added the  water to bicarb , nothing would happen.. Not concerned but just curious😊
    In London. Keen but lazy.
  • wild edgeswild edges The north west of south east WalesPosts: 7,490
    You'd need to add the water to a solid acid to get the same effect. I've added garden lime to my compsters in the past which helps raise the ph a bit.
    A great library has something in it to offend everybody.
  • B3B3 Posts: 21,435
    Do I need to? @wild edges
    In London. Keen but lazy.
  • wild edgeswild edges The north west of south east WalesPosts: 7,490
    Only if its acidity was causing a problem. It sounds like your tap water is doing the job well enough.
    A great library has something in it to offend everybody.
  • B3B3 Posts: 21,435
    No problem that I'm aware of so I'll log it as an interesting phenomenon😊 @wild edges
    In London. Keen but lazy.
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