This £10 Amazon buy will protect your garden birds from dangerous algae this summer – all you need to do is put it in your birdbath

Blue bird feeder in a garden full of flowers.

A wildlife expert is recommending a lesser-known hack to help purify and clean the water of a bird bath - all you need is this copper disc from Amazon.

Adding copper or even a penny to your bird bath is an excellent and natural way to prevent the growth of harmful algae, keeping the birds that visit your garden safe and happy to cool off in your bird bath.