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Help! How do I get rid of green water? | Decorative Ponds & Water Gardens Q & A


Help! How do I get rid of green water?

Q: Help! How do I get rid of green water?

Linda – Gardnerville, NV

A: Nope, there’s nothing nice about a pea soup-colored pond. Just about every water gardener dreams of a clean, crystal-clear pond – not an algae-filled eyesore. During the warmer seasons, what do you do to prevent and get rid of that unsightly green water? By making sure your pond is in balance.

For a stable pond that inhibits algae growth, you have to strike a perfect balance (or close to perfect, anyway) between fishes, aeration and filtration. And to keep it that way, you have to keep it well maintained. Here’s what you need to know to get rid of that green water.

Watch Fish Load, Feeding

Yes, it’s tempting to take home a dozen or more of those tiny koi from your favorite water garden retailer. But remember: those fish will grow and excrete nutrients that feed the algae. The rule of thumb is to allow 1 inch of adult fish per square foot of surface area, so don’t max out your capacity with one impulse buy at the koi store.

Speaking of fish, take it easy with the food. Feed them a quality diet, like Pond Logic® Growth and Color Fish Food, once a day, and give them only what they can gobble down in a few minutes. Anything more than that just adds excess waste to the pond – which is food for the algae. You can feed your finned friends more often, but be prepared to do more partial water changes or add extra filtration to handle the job.

Add Some Aeration, Bacteria

When you circulate your pond’s water with an aeration system, like the Airmax® KoiAir™ Water Garden Aeration System, you deliver oxygen to the bottom where all the muck – a.k.a. algae chow – sits. This oxygen helps all the beneficial bacteria, like Muck Defense® that’s found in the Pond Logic® DefensePAC® Pond Care Package, break down and consume the material there and throughout the water column, resulting in cleaner, clearer water. Plus, the aeration is good for your fish’s health, too.

Filtration – the Bigger, the Better

Go big with your mechanical filtration system. Make sure it’s at least big enough to handle the amount of water in your pond. Manufacturers rate filters for minimal fish load, so if you intend to have a lot of fish, go even bigger.

Plants – floating, submerged, marginals and bog varieties – make excellent natural filtration systems that complement your mechanical and biological filtration. Plants also shade the pond, keeping temperatures cooler and sheltering your fish. So try to cover 40 to 60 percent of your water with plants.

If you still have a pea soup colored pond after getting your fish load right, your feeding routine in check, your aeration system in place and your filtration system humming and growing, it’s time for the big guns – an ultraviolet clarifier. A UV clarifier, like The Pond Guy® PowerUV™ Ultraviolet Clarifier, will help to bind the green water algae so it can be pulled out by your filter.

Keep It Clean, Kind Of

Normal maintenance, like regular partial water changes and debris removal, can go a long way to get rid of excess nutrient buildup. But don’t overdo the filter-cleaning chores. Too much – meaning daily or weekly – washing of the filter media will wear the material down faster and wipe out the beneficial bacteria that actually clean the water. If water is unable to pass through the filter, simply rinse it lightly with water.

And if you don’t already, it’s always a good idea to do an annual spring cleanout of your pond to get rid of organic materials that feed the algae.

Pond Talk: How can you tell when your pond or water garden is out of balance?

Pond Logic® DefensePAC® - 5 Simple Steps To Clear Water

2 Responses

  1. For the last couple of years I have done the following to prevent green water. I use barley straw bundles ( I put one or two right in the skimmer box) I put a new one in as soon as I start up the filter and a new one every two months.
    One a month I rinse off the filters in my skimmer box. I also do water exchanges about 10 to 25% every two weeks. My pond has crystal clear water all season. I can watch my fish swimming in the pond from my 2nd story porch.

    Gloria“““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““““

  2. I added a square foot of furnace filter material right under the spot where the water returns from the fish’s mouth to the pond. This collects a LOT of the fine ‘scum’ from the water and helped clear up the murkiness. I weighted it down with rocks on the corners. My husband has improved upon the added filter by putting the ‘batting’ in one of those open-work plastic trays from the greenhouse and then weighing it down with some rocks. It’s much easier to lift the entire tray with the batting out to clean it than it was to just lift up the batting by itself. It really filters out what the ordinary filter misses! It’s in a small ‘upper’ pond (puddle) so it’s practically invisible. The ponds (we have 2) are crystal clear. The clear water must be desireable because we have 12 baby frogs in one of our ponds!

    We also sunk a plastic trash barrel in our vegetable garden 2 or 3 years ago and i’s filled with water that never gets changed……we have 6 baby frogs in that! There are some plants growing in it and they must keep the water clean.

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