Brown algae?


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Last year we replaced the pond liner and all the water. Since about July this year we have had a microscopic brown layer on the pond surface that now covers the entire pond. The water itself is not coloured other than we use a black organic dye but it’s definitely not caused by tannins. The pond has no fish just a bulrush and iris in containers with specialist pond compost. It’s impossible to scoop out the brown stuff even when removing duckweed with a net which I thought might act as a filter. When I do this the pond appears ok for an hour and then the brown layer returns. I thought the cause might be brown algae but l am not sure.
 

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j.w

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@Pieman could this be from runoff around the sides of your pond? Looks like everything around your pond is higher than the pond edge.
 
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Not sure what the dye is made from but it is excellent at giving the pond a reflective deep appearance that is quite spectacular when there is no brown stuff and is safe for pond creatures and stops blanket weed. I have used it without issue in previous years.

There certainly could be some runoff in the pond but it's not soil on the surface, I don't think. Interestingly, if you put your finger into the water the brown stuff moves away from the finger in a one-two inch circle. It reminded me of a scene from The Thing where the blood of the creature moves away from a hot object!
 

addy1

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Welcome to the forum!

Try running your water through some filter material like quilt batting. It collects real fine debris.
 
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Thanks. I would need to source a pump but it sounds like that might help.
 
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