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Should I do an Annual Pond Clean-out?


Just got this question today:

Customer  John K’s  Question:

I am sorry to keep bothering you but I am new to having a pond.  On your website you recommend California wetscapes and their checklist says they remove the fish which we have already done.  Then they pump all the water out of the pond, pressure spray the pond clean and then refill it.  Would you recommend this?  My pond was new last year, it has a few plants and got some mulch in it from the landscaping around it during the winter.  Now it has been running for a few days in 40 – 50 degree weather and it has foam all over it.  It is about a 4000 gallon pond. I have no problem draining and refilling it and would not mind pressure spraying it out, but I do not want to do this if it is not necessary.

PondMeister Answer:

I hope your landscapers did not use any fertilizers or poisons around the yard where the pond is. The slightest leaching can wreak havoc with the pond. If you need to fertilize anything back there, use pond water – it’s the best fertilizer EVER.

I am a big fan of annual clean-outs. All the debris that settles at the bottom is a haven for algae and other bad things. Best to start over. Make sure you de-chlorinate the water before you put the fish back in. Try to retain as much of the old water as possible. The guy who does my 6,000 gallon pond each year has 3 – 1,000 gallon temporary tanks so we can keep a large portion of the water and not stress the fish too much.

Below is Aquascape’s Official Instructions to their Contractor’s for Pond Clean-outs

Spring clean outs are usually done early spring, before your pond awakens from it’s winter dormancy. Clean outs should take place before water reaches 55°F.

Things you’ll need:

  • Container to hold fish and frogs
  • Fish net
  • Five gallon buckets to collect leaves and debris
  • Old clothes (You’re going to get dirty)
  • Gloves
  • 25’ of 1.5” or 2” discharge piping
  • Sump pump with a screen or skimmer pump with chicken wire around it
  • High pressure nozzle for your garden hose or power washer
  • Garden shears (for trimming plants)

 Steps for successful clean out:

  1. Begin draining pond. Use your pump with chicken wire or screen around it to help protect fish from being sucked in. Use some of this water for the container to house fish in. Also make sure you move the piping around a few times so all the water doesn’t go in one place. (This water is excellent for fertilizing plants.)
  2. When water level reaches about six inches, turn pump off and catch fish. (It’s a waste of time to try and catch then when pond is full!) Place fish in container and make sure to cover if you have Koi because they do jump.
  3. Once fish and others are in container, begin hosing down rocks and gravel.
  4. A high-pressured nozzle or power washer should be used for hosing down rocks. Don’t wash away all algae because a little bit will be beneficial in developing your ecosystem. (For an average size pond, 11’x16’, this takes about 15 minutes.)
  5. Take this opportunity to trim back any plants that appear to be overgrown.
  6. The most time consuming part will be washing the debris off your rocks and gravel. DO NOT use the power washer for this; use the water coming out of the garden hose. Keep pump plugged in, water and sediment will go to the deepest part of the pond so it will be able to get sucked out.
  7. Clean out skimmer box by sucking out water and hosing down. Clean out net and filter pad too.
  8. Clean your BIOFALLS mats and lava rock by hosing them down until they’re clear.
  9. Now that the pond is pretty much cleaned out, remove the pump and begin filling the pond. Once your pond is half full you can begin to reintroduce your fish and plants.
  10. Remember…if you’re using city water, you need to use a de-chlorinator such as Pond Detoxifier from Aquascape. Chlorine will kill fish. Add the appropriate amount of de-chlor so you can start adding fish. Dip your buckets into the holding tank and fill them with a few inches of water. Add your fish and float the buckets in the new water.
  11.  After around 15 minutes, begin splashing pond water into the bucket. By now temperatures should be close to the same (pond water and bucket water). You can now add fish into pond.
  12. It’s very important at this point to add Beneficial Bacteria to “jump-start” the ecosystem in the pond.  If the WATER temperature is between 45 and 55 degrees, use Cold Water Beneficial Bacteria from Aquascape and if the water temperature has already warmed up over 55 degrees, use either Beneficial Bacteria for Ponds – Dry or Beneficial Bacteria for Ponds – Liquid.

 Note: Clean out should be done in timely fashion. Fish are weak in the spring. They shouldn’t be kept in full sunlight or in container outside of pond for more than a few hours.

date Posted on: Sunday, April 3rd, 2011 at 8:03 pm
Category Pond Tips, Questions and Answers.
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