Could Barley Straw be the Cause of My Red Pond?

By: Dr Gareth Evans - Updated: 3 Aug 2019 | *Discuss

 

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Q.

I have had my pond now nearly 3 months, I have cracked the water quality issue, well that's what the tests tell me. The pond is not green anymore, however, it has started to go a redish colour, the pond walls are red too with what looks like dead algae, I have barley straw in the pond should I take this out?

A.

I’m sorry that you’re having this problem with what I assume is a new pond.

Obviously it’s a little difficult to be sure without knowing a bit more about the history (it sounds like you’ve had some water quality problems) the dimensions of the pond, its location, how it’s stocked and so on – but hopefully a few suggestions will help you sort things out. You’re probably going to have to do a bit of CSI-type work to figure out what’s going on.

Barley Straw

Algae, Minerals and Bacteria

On balance, there seem to be two likely candidates for causing what you’re experiencing –mineral staining or bacteria. Excessive iron or manganese in the water might cause some or all of the results you’re seeing – and if your water tests previously showed elevated levels of either of these, then that would certainly be something to explore further.

However, I suspect that you may be suffering from one of the Serratia bacteria – most probably Serratia marcescens. Widely present in nature, these bacteria thrive in any wet or damp environment and spread in the air; a pond rich in phosphorus and other nutrients, and with well conditioned, un-chlorinated water unfortunately makes an ideal home. If your pond was previously very full of algae, their die-back may have released a spike of nutrients into the water and provided a bonanza opportunity for bacteria to colonise and grow.

For the Future

Another important aspect of algal control involves regulating the amount of light and nutrients available for algae to grow, especially in the early part of the summer. Making sure that your pond has adequate surface cover, being careful with fertilisers around the pond margin and keeping as much of the dead leaves and other organic matter out of the water as you can will all help keep the scourge of green water at bay.

Keep up the water testing too; many pond-keepers don’t really bother, or do it in a rather hap-hazard way, but as you quite rightly realise yourself, it’s the only way to be sure the most critical part of the pond environment stays in good health.

Best of luck with dealing with your problem; hopefully you’ll soon have a pond to be proud of!

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