I built this pond around 1996/7, the pond has always been the same dimensions apart from depth, which I increased from 3' to 5', in around 2005, at this time took the opportunity to add bottom drain and box welded liner as previous liner caused problems with folds in corners, these video's are my diary from around 2017, at which time I also added combi drum filtration.
All opinons and instructions given are my own thoughts and not necessarily correct.
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Thank you
marekswan63@gmail.com