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When you have a pool it's important to know how and when to change your pool filter sand. In this video Andrew Donkin will be showing you just that. You need to change your pool filter sand every 2-3 years when the water is murky, needs frequent backwashing or your pool cleaner is struggling. View products here: bit.ly/2RyXGTE and shop online with Builders. Signup here: goo.gl/vNuQ6n.