top of page

How do I clear my green pond water?

You want crystal clear pond water. Doesn't everyone? At Cool Ponds, we're experts at building ponds that people enjoy, and that means creating ponds that are easy to take care of and remain crystal clear-- always! Read on to learn how we keep our ponds clear of green water.

crystal clear pond water

Not all ponds are alike! Your climate, your tap water, your fish load, the frequency you clean your pond, your pond's history-- all of it make your pond totally unique. Anyone who tells you they have a magic bullet for your green water ailments is lying. 

It cannot be stressed enough that if you can come to our support center, please do so! Bring a water sample and some photos, and we can diagnose your pond and recommend the right products for your pond-- after all there is no one-size-fits-all solution. 

5 Steps to Clear

Green Pond Water*

*Make sure you actually do have algae and not floating debris (which is treated very differently).

pond filter to clear water
pond filter to clear water

Step 1.  Add a filter.

Your filter system needs to do these things: remove junk from the water and house beneficial bacteria. Ideally, it will also be easy to care for and not be an eyesore. We have options that fit all this criteria! (If you're not convinced your pond needs a filter, read our filtration primer on our blog).

pond rocks clear water

Step 2.  Add rock.

Rock is not only great for aesthetics: it's also essential to growing beneficial bacteria too! At the bare minimum, you need 1-2" of river rock on the bottom of your pond.

Step 3.  Aerate your pond.

Although having a waterfall or a fountain is important for circulation, it doesn't count for aeration. An aerator pushes oxygen from outside the pond to the bottom of the pond.

pond plants fight green water

Step 4.  Grow the right aquatic plants.

To battle algae, you need to starve it. The right aquatic plants will compete directly with algae for nutrients. Make sure you have floating plants and / or marginal plants, and make sure you have plenty of them!

pond treatments for algae

Step 5.  Supplement your beneficial bacteria.

Not all bacteria treatments sold on the pond product market are alike, and some are just plain worthless. The pond treatments we use and carry at Cool Ponds are potent, effective, and environmentally safe. You need to use bacteria regularly, so follow our instructions for best results.

These five steps are a perfect start to your journey to crystal clear pond water, but they aren't the whole story! Your pond is unique. Bring a water sample and photos of your pond to our support center for a complete diagnosis.

Grab Our Clear Water Checklist

We've made navigating the path to clear pond water easier for you with our clear water checklist. 


Click the image above to open the PDF in your web browser.

Get Our Treatment Regimen

It can be confusing knowing what water treatments to use and when and how much and how often... So we've cleared that up for you! 

We have a schedule and dosage chart in a convenient PDF for you to download. Hang in on the fridge, keep it in your treatment tote -- and remember to use it!

Click the image above to open the PDF in your web browser.

If you have more questions, we have more answers.

how to oxygenate your backyard pond
algae in your backyard pond.png
what is pond filtraion.png
bottom of page