On Friday 26 July 2013 09:57 Broadback wrote in uk.rec.gardening:

I have set up three rainwater butts, linked at the bottom. works quite
well but from time to time develops a leak in one joint or another. I
have been looking at larger storage tanks, but they seem ridiculously
expensive. Any suggestions?

Make better joints.

What fittings and pipe are you using now?

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