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Water additives

At Netherton koi, we keep a variety of water treatments  in stock all year round.  See below for some of our most popular treatments. Customers ca n purchase these products either by visiting in person or by contacting us with your requirements.  Shipping is available on all dry goods subject to a carriage charge.  All prices include VAT.  


Aqua Source Blanket Weed Resolve

500G  - £12.50

1KG - £18.00

2KG  - £35.00

B lanketweed becomes resistant to treatments after continued use, and this is why our brand new treatment will work when others fail, even at low temperatures.

The only Blanketweed treatment that reduces Phosphates, which contribute to blanketweed growth.

Aqua Source Blanket Weed Resolve is completely free of Algaecides, Biocides, Pesticides, ammonium compounds and metal salts. It is harmless to animals and plants and will not affect your filter bacteria. Your pond water may turn slightly cloudy for 3-4 days, this is perfectly normal. As with all pond treatments, ensure that the pond is well oxygenated. A kH above 2 is recommended, if unsure add some kH buffer.

No need to mix, just sprinkle around the edges of your pond.

Can be used safely with other medications in the pond.

A unique product that quickly eradicates unsightly blanketweed from your pond, when used as instructed.

Brand New Formula

Fast Acting

Completely Harmless to Fish, Plants & Wildlife

Reduces Phosphates

Works at low temperatures

Safe for Sturgeon and Sterlets

Available in 250g, 500g, 1kg and 2kg

250g Treats 7500 litres (1649 Uk Gallons)

500g Treats 15000 litres ( 3300 UK Gallons)

1kg Treats 30000 ltrs ( 6600 UK Gallons)

2kg Treats 60000 ltrs ( 13200 UK Gallons)

Dosage is 25g per 750 litres (165 gallons), added directly to the pond. UV Clarifier can be left on.

Repeat dose every 10 days over 30 days, if necessary, then add one dose monthly to prevent reoccurrence.

No need to mix in a bucket, simply sprinkle directly around the edges of your pond.

Wash hands after use and keep away from children.

Netherton Koi


Aqua Balance FILTER GEL

1LTR - £19.00

2.5 LTR - £35.00

Aqua Balance Filter Gel is a super concentrated

cocktail of essential bacteria, designed to speed up

the maturation process of new filters and help the

recovery of biological activity after adding

chemical treatments to established ponds. It can

be used on all types of filter media, including

sponges, plastic media, ceramics and matting. The

Gel will stick to the media, rapidly accelerating the

biological process.


Shake the bottle well before use. Switch off the

pond pump and air pump to the filter. Pour the

contents across the media, ensuring an even

spread. Leave for one hour and then switch the

pumps back on. Adding extra oxygen will help the

process Switch off UV Clarifier for 8 hours.


Do not swallow, if swallowed drink plenty of water.

Store in a safe place at room temperature. Keep

out of reach of children. Wash hands after use.

Shake bottle well before use.

1 ltr treats 20,000 litres ( 4399 UK Gallons)

2.5 litres treats 50,000 litres ( 10,998 UK Gallons)


Aqua Balance VITALIZE

1LTR - £22.00

2.5 LTR - £44.00

Improves well being and vitality of your fish and pond

Strengthens fishes natural immune system

Contains natural ingredients including Aloe Vera to help relieve stress

Can be used a dechlorinator

Can be used to neutralise potassium permanganate

Available in 2 sized bottles; 1Ltr & 2.5Ltr

Aqua Source Aqua Balance Vitalize has been developed to help your fish thrive and keep your pond healthy. Aqua Balance Vitalize strengthens the natural immune system of your fish, thus improving resistance against pathogens.

The combination of natural ingredients in Vitalize, including Vitamins and Aloe Vera, can help after stressful situations such as transportation, netting, rainfall, pH changes and after adding medication to the pond. Vitalize can also aid recovery from wounds and ulcers.

Vitalize can be used as a dechlorinator (dosage 20ml per 1000 litres changed) and also removes heavy metals.

Vitalize can also be used to neutralise potassium permanganate, which is very useful if your fish are in distress during treatment. This can be performed at a dose rate of 20ml per 1000 litres, whilst a further 20ml per 1000 litres will clear the water from brown to clear.

Aqua Source Aqua Balance Vitalize Dosage Rates:

- Aqua Source Aqua Balance Vitalize 1Ltr - Treats 20,000 litres

- Aqua Source Aqua Balance Vitalize 2.5Ltr - Treats 50,000 litres


BactoPlus Fresh PSB 2000ml 


Living photosynthetic bacteria for superior water quality.

Unique living PSB bacteria cultured in the Netherlands. Fresh PSB is active immediately after being added to your pond.  It improves water quality and clarity bu removing ammonia and other impurities from the water.  PSB bacteria do not consume any oxygens, so they can be used at very high dosage levels.  

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