We have an 80,000 gallon Koi pond. It has never been filtered and the water is green.

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Over the weekend we spent big bucks and bought an aerator for our back 1/4 pond. The results are amazing. Probably going to put one in the koi pond too.
 
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Over the weekend we spent big bucks and bought an aerator for our back 1/4 pond. The results are amazing. Probably going to put one in the koi pond too.

Great news! It may be expensive, but the results will be long lasting and satisfying!
 
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Now that you have circulation breaking down organic material, you're going to have nitrates and phosphate available.
I recommend measuring for those 2 plus KH and GH.
Bacteria require oxygen from the circulation, carbonates and trace minerals to keep doing their job.
Excess nitrates can be taken up by plants, but string algae may be what benefits from the phosphates.
Phosphates can be chemically bound by clay or be consumed by plants.
 
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BOG filter and a intake bay will fix your issues!! I’m so happy I did a BOG. Only way to go you can build an external bog and flow water through it back into your pond.
 
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I dOUBT THERES MANY NEWBIES WHO DIDNT DO THE SAME.
 

Dave Cee

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Welcome!
 

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