Budget pumped rainwater storage. Commercial rainwater storage can be several thousand pounds. To save money I wondered if you could bury an IBC and it turns out you can ! Here's a complete pumped rain water system for about GBP 100.
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Step 1: Dig a Big Hole
Dig a very big hole. A standard IBC can be bought for GBP 40-50 and is 1mx1mx1.2m. It took about 3 evenings after work to dig the hole. We're lucky and have nice light soil.