Dark cloudy water

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Hi can anyone tell me why my pond water is very dark and cloudy the levels are good I have a great filter system and I’ve kept it mostly covered during periods of extended sunshine and during the heatwave I treated it for blanket weed 3 weeks ago there is no evidence of any come back of that.
Any suggestions would be happily received
Thanks

Tyke
 
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I have a bigger pond now approx 3m x 4m 5’6” deep a filtreu drum filter it’s been fine up until about 2/3 weeks ago you can see the fish when they come to the window but 18” down you can’t see them you could see the bottom clearly and the bottom drain but not now.
 

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I feed them kusuri pellets once a day and they seem to eat it all after ten minutes unless it’s sunk and I can’t see it.
 
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It’s not a patio pond it’s approximately 4x3mtrs and about 1.5 depth and capacity is 16,700 litres
 
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Wow! That looks amazing! It looks like an outside aquarium.

Is it just one side that is glass or more than one side?
Is it glass or plexiglass? Looks like glass.

Is the water actually green or is there a film on the inside of the glass?
Do you use one of those magnet scrubbies to clean the inside of the glass like they have for aquariums?
 
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Just one window it’s glass and I clean it regularly it’s the water that’s discoloured
 
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I feed them kusuri pellets once a day and they seem to eat it aOUTll after ten minutes unless it’s sunk and I can’t see it.
That's probably problem number one, it takes my fish less than 10 seconds to wipe out the food on the surface. I MAY GIVE A SECOND HANDFUL, but again its gone in seconds look at every pellet as a hamburger three should be way more than enough. Small more often feedings is what the koi raised ponders go with . Boggers we do far less and encourage the koi to graze as that what they are.

What size micron mesh are you using? 300, 200, 100, 70?

i use a bog filter my water is clear to where i can see a dime amongst all the rock down 6 feet. But for a polish i am in the process of a dyi sieve im leaning toward a 100 micron

16,700 liters is only 4500 gallons and that equals to you are over crowding i'm counting 16 good sized fish? mostly koi? One large koi should have around 1000 gallons on it's own and a minmum of 500 gallons for each after that.

This can be altered by increasing how many times you turn over the pond an hour. which brings me to the next question how many liters per hour does your pump and filter run at?

along with the drum filter what else are you running a fluid bead filter? a foam block ? pressure filter?
 
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