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St. Louis metro

Koi pond and water garden cleanouts

Years of leaves, fish waste and string algae settle into a thick layer of muck. A full cleanout resets the pond so the water clears and the filter can keep up again.

Illustrative photo
Pond technician in chest waders vacuuming sludge and leaves from a partly drained backyard pond with stacked stone walls
Illustrative photo, not an actual job.

Signs it's time

  • Green, brown or cloudy water that doesn't clear with the filter running
  • A thick layer of muck or leaves on the bottom
  • String algae choking the waterfall or skimmer
  • A swampy smell, or fish gasping at the surface
  • It's been a few years since the pond was fully drained

What the visit usually involves

  • Catching fish and holding them in aerated tubs with pond water
  • Pumping down the pond and saving some of the old water for the fish
  • Removing muck, leaves and dead plant material
  • Rinsing rocks and gravel (pressure-washing is usually kept gentle so helpful bacteria aren't stripped)
  • Cleaning the skimmer, filter media and pump intake
  • Refilling with dechlorinator and slowly acclimating the fish back

Every pond and every pro is a little different. The pond professional you're matched with will explain their own process and price before any work starts.

Have this ready when you call

  • Rough size of the pond (length x width x depth is fine)
  • Whether you have koi, goldfish or no fish
  • How long since the last full cleanout
  • A couple of phone photos of the water and the waterfall

Questions

How often should a koi pond be fully cleaned out?

Many ponds only need a full drain-and-clean every year or two, with lighter cleanings in between. Heavily stocked koi ponds or ponds under trees may need it more often. The pro who looks at it can give you a better read.

Is a cleanout stressful for my fish?

Any move is some stress, which is why a careful cleanout holds fish in aerated tubs filled with their own pond water and brings them back slowly. Ask the pro how they handle fish before the visit.

Free to request

Need pond cleanouts?

Call now and get matched with a local pond pro.

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Talk to someone about your pond

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  • Free to request, no obligation
  • Your info goes only to the pond pro handling your request
  • Photos help: you can text them after the call

STL Pond Cleaning is a referral service operated by Thurr Solutions, not a pond contractor.

Call (314) 445-5517