Thank you for all the welcomes. Have a kio pond in my garden half full of green water. Koi were sold and pumps etc dismantled and sold. Dont want to spend money on pumps etc so just want to have a natural pond there. Trouble is have 3 pipe holes about a foot down that need to be closed off otherwise pond will just leak if i refill with water. What is the best way of shutting off these pipe holes?
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