What size bottom drain should I fit on my Koi pond is a question I see asked a lot on the koi forums and Facebook groups. Worryingly it is usually answered with 'fit the biggest one you can' or 'the bigger the better' , which unfortunately is not always good advice.
Settlement in bottom drain pipework is a major cause of bacterial infections as the silt created is a perfect breeding ground for bacteria.
In this video I go through what size you should ideally fit and if that isn't possible, offer a solution for preventing problems even with the wrong sized drain fitted.
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