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Tips For Controlling Blanket Weed

ByKevin Simon

May 11, 2016


Blanket Weed is the curse of keeping a pool. If I could invent something to eliminate blanket weed without causing any other problems I would be a millionaire overnight!

A little blanket weed is no problem, this is an indication that you have good water quality as blanket weed will only grow in good water. Blanket Weed needs certain nutrients to grow and take over the pool, being a water plant it has to fight for any food available, so if you can reduce the food available then this will help to control it. So never worry about some blanket weed. Excessive weed can be a problem, either choking the other plants, blocking up pumps and filters, as well as looking unsightly. It can help if you know how blanket weed grows too much. Here are just a few:

Excessive sunlight Reduce direct sunlight by using more large leaf plants i.e. Lilies or surface cover plants.(see plant notes below) Using greenhouse netting either loose or on a frame can be used on bright days and removed when not needed.

Excess oxygen Reduce the amount of oxygen entering the pool via waterfalls, fountains etc. but care must be taken not to deplete the oxygen level too much. (see article on air stones)

Fresh water Reduce the amount of fresh water being added to the pool. If you need to top up the pool too often Why? Is it because of a leak in the pool or waterfall etc. if so let me know so I can try to fix it. Try to use rain water, providing the water is clean and the ph is low, or water left to stand for a couple of days using rain barrels or tanks attached to your gutter down spouts etc. These are normally fairly easy to install, if you need any help or advice just let me know.

Fertilisers The worst one is lawn feeds. If you need to use these try not to use them within a least 6 feet (2 meters) of the pool, this applies to any type of fertiliser as well as the use of pesticides etc. The best feed for the garden is rain water or pool water.

Fish food Overfeeding of fish food not only is it very harmful for the fish, but excess, uneaten food feeds blanket weed. Fish food not only contains minerals and nutrients that are suitable for healthy fish but it also helps Blanket Weed thrive. Only feed the fish enough food that the fish can consume say in 10 minutes, any food that remains uneaten must be removed and reduce the next feed by this amount. (see article on fish feeding)

Remember if you have Blanket Weed growing out from the sides of the pool then stop feeding the fish as they can and will eat the Blanket Weed, its Natures Natural Fish Food. Fish Waste Now the fish produces this when they are eating and too much waste is not only harmful to the fish but is a good source of nutrients for Blanket Weed. The way to control the excess waste is to have adequate filtration and ensure the pool is kept free of too much debris. Remove dead leaves etc. update your pool filtration to remove concentration of sludge etc. This will not only keep your pool fresher and clean but will also help to keep it clear.

Plants Have adequate plants in the pool that not only cover the pool surface but will help in fighting for any nutrients available thus starving the Blanket Weed. Now no matter how much you try sometimes you can never seem to get rid of the Blanket Weed, now some in a pool is normal, in fact if you do not have any Blanket Weed I always say get worried as Blanket Weed only grows in GOOD water so if none is present then the possibility is that your water is not as it should be. There can be numerous reasons why your water quality is not up to standard the main one being too much rotting debris in the pool or filter, which is why it is important to have the pool and filters serviced regularly.

Poor water quality is not only harmful to the plants but can sometimes be fatal to the fish and other aquatic life, so by observation of the pool and its condition most problems can be sorted before they get too bad and you start to loose fish etc.

There are a lot of chemical treatments for Blanket Weed, though in my experience these are a temporary fix as they only work for a few weeks then you are back to square one. If you do use any chemical treatment make sure to read the label and instructions carefully as too much can have a detrimental effect on fish and other plants in your pond.

Information in this article is either wrote by myself Kevin Simon or from a archive of articles my father wrote for previous pond and pool services newsletters (PPS), and now supplied by KS Pond Services. A Midland based fish pond servicing company for more details on the services that we can supply please get in touch HERE


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*Information in this article is either wrote by myself Kevin Simon or from a archive of articles my father wrote for previous pond and pool services newsletters (PPS), and now supplied by KS Pond Services. A Midland based fish pond servicing company for more details on the services that we can supply please get in touch [HERE](*
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On a side note I converted a Peugeot partner into a stealth micro camper and I’m vlogging about my travels Inc. info on photography on Youtube, Now as I have a spinal problem this means cant walk that far & also in a lot of pain but still visit loads of places, so why not SUBSCRIBE to stay up to date with the latest videos, these also Inc. reviews of gear, hobbies and anything else, just like this blog. You can also follow me on other social media inc Instagram, Facebook, Twitter & flickr, or subscribe to this blog

Kevin Simon

I run this blog & also self employed cleaning out fish ponds, but due to spinal problems not able to do as much, now started a youtube channel showing my converted Peugeot Partner micro camper also as interest in photography so now vlog about the trips and of course Lego figures out in the wild photos.

2 thoughts on “Tips For Controlling Blanket Weed”
  1. I have inherited a fis pond not very big but needs a bit of TLC would you be interisted in having a look it’s a raised pond so not a lot of bending in sheldon /Solihull area

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