top of page

Water Treatments 

Water quality is the most important factor in a Koi pond. Koi and other aquatic life can survive in less than ideal conditions however one thing Koi keepers can do to help their fish thrive instead of survive is to make sure that the minerals and trace elements found in natural ponds are in the water in their koi ponds and water gardens.


In almost all cases, the water used to fill our ponds is deficient in most of the minerals and trace elements needed to allow our Koi to reach their maximum potential. What little minerals you have in your pond water are quickly absorbed by the fish, plants, and even the bacteria that colonise your filters. 


The only way those minerals can be replaced or introduced is through water changes and additives. The highest quality Koi in the world are raised in mud bottom ponds. Even the top koi breeders have to add fresh clay to their ponds to replace the minerals and trace elements 


Envirex was created to make ponds far more hygienic and less chance of disease developing in the fish. Envirex degrades all types of solid waste matter whilst lowering ammonia, nitrite, nitrate and phosphate and other unwanted substances in pond water. The product can help to reduce the amount of filter cleaning, pond vacuuming and general maintenance. Envirex is a natural product and cannot kill blanket weed or algae like a chemical but it can inhibit its growth but this requires regular use.

Assessing the dose: All benefits of Envirex are seen with regular use and this is safe as it is non chemical. Customising the dose level to suit individual ponds allows for economic control. The amount required is directly related to the volume of fish stocked and the food they consume not the gallonage and this is why the dose level can be adjusted by the user as ponds vary greatly. If the fish create more waste one week due to heavy feeding use Envirex two or three times that week and then revert to normal use the following week.

Instructions for first use: Envirex should be mixed with water to a milky consistency before introduction into pond or the filter.  When first using Envirex 80 grams per 1,000 gallons to a new pond or 40 grams per 1,000 gallons to a mature pond and wait a few days for settlement. 


Regular applications: After settlement commence weekly use. The average pond with a low stocking density needs 5 grams per 1,000 gallons every 4-7 days to control unwanted substances and solids. However overstocked ponds or those with water quality problems may need 15-20 grams per 1,000 gallons adapt to individual needs.


Envirex is natural and harmless overdose is impossible. The product can be used all year round but if discontinued for winter re-seeds the pond with the first application dose again in spring. There is no need to switch off ultra violet sterilisers when using Envirex and the product does not interfere with any pond medication.

Available in 300g & 2kg

Pond Detox-PDX

The list of substances that can end up in a pond is endless. In some cases, the fish may be mildly affected by a contaminant whilst the degree of toxicity in other ponds can be severe.


Even at low levels, fish are more susceptible to disease when exposed to any water contaminant. Pond Detox Formula neutralises all forms of pollution, improves water clarity, and settles particles. It can enrich the water improving skin lustre and optimising fish health.


  • Airborne pollution

  • Tap water contamination

  • Heavy metals

  • Horticultural products

  • Plant toxins

  • Acid rain

  • Ammonia

  • Nitrite

  • Chemical overdose and general poor pond water conditions.

When the fish are at greater risk more Pond Detox Formula will be required as a neutralising agent whereas minor irritation following heavy rain for example may respond to less of the product depending on the acidity of the rain.


Pond Detox Formula can also be used in quarantine, hospital, or temporary tank facilities.


Available in 300g & 2kg


Combat is a pond water treatment formula blended from various substances that can lower common water borne pathogens. Most ponds will harbour harmful organisms that can eventfully cause disease to the skin or the gills of fish. If levels are allowed to remain untreated the potential risk of various types of disease both primary and secondary increases.


The standard dose is 10 grams to 1,000 gallons of water and this will lower the potential for any water borne bacteria, parasites or other harmful organisms to reach a level where the fish are at risk.


In cases where pond hygiene has been minimal for some time or the pond water has been allowed to return to the pond after filter maintenance the possibility exists that any pathogens harboured in the filter have been disturbed. This places the fish at a greater risk from water borne organisms and a higher dose of 20 grams per 1,000 gallons is recommended.

FOK Bio Factor​

A unique high purity Montmorillonite clay.  Remineralises water, improves water clarity, Koi colour & lustre, aids health, stimulates appetite. 

Kusuri Klay now widely used throughout the UK, Europe, USA and the far east, is a beneficial weekly pond additive. A fine white powdered product that when added to any pond environment will release minerals through ion exchange. Using Kusuri Klay weekly in your pond will reap its own rewards as you will see better water clarity usually about 24 hours later, and better colour & lustre on your Koi after a few weeks.

Kusuri Klay also is a positive benefit to health as fish adsorb minerals in large quantities from the water which helps bone & cellular growth. 

Since Kusuri Klay was introduced the use of Montmorillonite clay in ponds has become very popular with pond keepers. 
How to use Kusuri klay into ponds 

Use I



Virkon Aquatic ​


Refresh powder is used for improving the white skin and strong colours particularly red and black . 

Refresh is also a superb way of improving the water quality if used on a regular basis. 

Water treated with Refresh actually adds a sparkle and improved clarity to the water. 

Full of minerals and essential vitamins for growth and healthy Koi. 


Add 62.5grams per ton for the initial dosage and then replace pro rata with fresh water being added. 

Ensure that is is mixed thoroughly with water to an emulsion paint type consistency before adding to prevent it 'clumping'. 


Melafix ​

bottom of page