Murky, brownish water.

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Hello pond folk. My 6 year old pond is experiencing something that has never happened before. I battled string algae for 2 years and finally beat it with an ionizer. This year I'm going batty trying to figure out what this new, water born algae is. I did my water change in spring. I did it again last Saturday because the water was so Murkey. 5 days later back to murky. My pond gets a ton of sun, more than last year because we had some very large white pines taken down. I really don't want to use algacide to clear this up, but it seems very aggressive. Included are pics from inside my skimmer. It's resting on the brushes but becomes water born as soon as you touch it. Really bothering me because my pond is usually crystal clear.
 

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kinda need more information.
size of the water feature.
amount of water circulation
amount of plant life
type of filtration
how many fish/load on the environment
how much are you feeding your fish.
what are your water parameters. IE PH, Nitrate, Nitrite, Ammonia.

Algae is unsightly. it is the lowest form of plant life, having algae is a good sign that your water feature has the nutrients to support plant life. this is a good sign. you see algae and plants compete for the same nutrients in the water. it takes a good month or more for plant in a pond to settle in and start to do there job to take away nutrients from the algae. this is why you will always have a algae bloom in the early stages in the spring.
you have increased your direct sun light to your environment how are the plants responding to this change? are they healthy? showing new growth?

removing nitrates and nitrites from water can NOT be done through filtration it can be removed through Ion exchange units, reverse osmosis, or distillation, all can be expensive. the better solution is to increase you plant life, aeration at this point would be a must.
 
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"Beating" the string algae with an ionizer left you with lots of dead organic material in the pond, which just feeds more algae... vicious circle. Same thing happens when you use algaecide - you're treating the symptom, not the cause. You want to "beat" algae by starving it out. Good advice from @Beercan31 - reduce the nutrient load. Fewer fish, less feeding, more plants, etc.
 
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kinda need more information.
size of the water feature.
amount of water circulation
amount of plant life
type of filtration
how many fish/load on the environment
how much are you feeding your fish.
what are your water parameters. IE PH, Nitrate, Nitrite, Ammonia.

Algae is unsightly. it is the lowest form of plant life, having algae is a good sign that your water feature has the nutrients to support plant life. this is a good sign. you see algae and plants compete for the same nutrients in the water. it takes a good month or more for plant in a pond to settle in and start to do there job to take away nutrients from the algae. this is why you will always have a algae bloom in the early stages in the spring.
you have increased your direct sun light to your environment how are the plants responding to this change? are they healthy? showing new growth?

removing nitrates and nitrites from water can NOT be done through filtration it can be removed through Ion exchange units, reverse osmosis, or distillation, all can be expensive. the better solution is to increase you plant life, aeration at this point would be a must.
It's about a 1500 gallon pond, lots of healthy plant life. 6 medium to small goldfish and just added 6 juvenile koi, approx 4 inches long. Ammonia and nitrates are at the lowest ppm, so there's no issue there. I guess my concern is that I've had green algae on rocks and string algae, I've just never had this floating brownish stuff before and wasn't sure how to tackle it. Thank you for taking the time to respond. Also, I've been feeding them twice a week.
 

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So you went the wrong direction - those six "juvenile" koi will soon be a foot long each and will overwhelm your 1500 gallon pond. Get ready for more string algae at this point.
 
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good grief do you understand one koi with good genes can reach 12inches in one year and 20" by year two. now yours may not reach those numbers but when and if they strat growing one day the pond will be fine and healthy then the next everyone's dead from overloading
 
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Your murkey brown water i am fighting as well and i blame it one the fires in Montreal and then the heavy rains washing it into the pond
 

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