NT Labs Acriflavin

NT Labs Acriflavin

NT Labs Acriflavin is a treatment for bacterial ailments such as fin-rot and ulcers in Koi ponds or quarantine tanks. NT Labs Koi Care Acriflavin is best used in conjunction with NT Labs Ulcer-Swab and Wound Seal in the treatment of ulcers and other open wounds.

All ponds will contain billions of minute bacteria. These include helpful species that breakdown the toxic fish waste in the biological filter system, and convert it into nitrate, which is then taken up by the plants. However, there are also other bacteria that live in the pond that are opportunistic invaders of stressed and wounded fish, including the species Pseudomonas and Aeromonas which will infect any cut or abrasion on the surface of the fish, and can also invade the host across the gut wall during gastro-intestinal problems.

When added to the pond, NT Labs Acriflavin will reduce the numbers of these opportunistic bacteria in the pond, thus lowering not only the chance of infection, but also the intensity of disease in already infected ponds. Acriflavin is ideal to use in hospital or quarantine tanks, but it is unwise to constantly add the treatment to the pond when the fish are healthy. This is because a background level of bacteria is essential for healthy fish to maintain their immune system.

Dosage Rates:

  •  NT Labs Acriflavin 250ml – Treats 9000 litres / 2000 gallons
  • NT Labs Acriflavin 500ml – Treats 18000 litres / 4000 gallons
  •  NT Labs Acriflavin 1 Litre – Treats 36000 litres / 8000 gallons

Instructions for use:

  • Switch off UV until all the colour of the treatment has gone from your pond.
  • Wait 10 days after the final dose before treating with any other pond medication.
  • If you feel that a repeat dose is necessary, check your diagnosis carefully, a different medication may be more suitable.
  • Do not treat with water temperatures below 10 degrees or over 30 degrees.
  • Remove any Carbon or Zeolite from the filter or pond.
  • Top up your filter with live bacteria as treatments damages filter bacteria


  • For Bacterial Ailments
  • Mild Anti-Septic Treats Fin-Rot,
  • Mouth-Rot & Ulcers
  • 250ml treats 9000 litres (2000 gallons)
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Medikoi Health
Medikoi Health

Medikoi Health

Medikoi Health food is the ideal way to support the immune system of your Koi through the food’s unique ingredients including: lemon peel, olive leaf, Artemesia and Propolis. Another vital ingredient is Stimune, this helps the fish’s natural immune system to fight infection.

Medikoi Health contains a unique natural herbal formula developed in our laboratories which helps to maintain resistance to disease and a wide variety of infections


Soya, Wheat, Fish Meal, maize, Fish Oil, Herbs , Propolis.


Protein 33%, Oil 3.1%, Herbs 750mg/kg, Propolis 1500 mg/kg, Stimune 1000 mg/kg.


Vitamins / Kg: A 26250 IU, C 350 mg, D 3000 IU, E 233 mg, Stimune 1000mg Herbs 750 mg, Propolis 1500mg, EEC Permitted Preservatives and anti-oxidants.

Available in the following variations:

3mm Pellet – 750g, 5kg & 10kg.

6mm Pellet – 1.75kg, 5kg & 10kg

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G4 Green Pond Sealer
G4 Green Pond Sealer

G4 Green Pond Sealer

G4 Green Pond Sealer is a moisture cured polyurethane which forms a non-porous seal on concrete rendered ponds, it uses the moisture in the air and the render to harden, G4 Green pond sealer can be applied to slightly damp surfaces, but it is important that the render is sufficiently dry to be porous so as to enable the first coat of G4 pond sealer to bond and obtain a mechanical grip, G4 pond sealer can be applied in poor weather conditions, high humidity and at temperatures down to zero degree’s.

Koi Pond Construction Materials

As a general rule the pond should be constructed to be structurally sound since the G4 Green pond sealer only provides the waterproof seal, on no account use a P.V.A based sealer to seal or prime any surfaces, these materials can contain ammonia and also stop the G4 pond sealer from adhering to the render.

Ponds will normally be constructed with either brick, lightweight block or concrete block and then rendered, it is not necessary to add waterproofing agents to the render mix as this will increase the density of the render and can inhibit G4 pond sealer penetration, if a waterproofing agent has been used, simply rub down the surface with an abrasive to obtain a key.

If a fibre is used to give strength to the render it is necessary to burn off or sand down any fibres that are on the surface, as any fibres that protrude will cause leakage, G4 pond sealer will not bond to the fibres.

The cement render should be trowelled to an even surface but not to a smooth dense plaster like finish since this prevents the penetration of G4 pond sealer, new render should be kept damp for the first three days and then allowed to harden for 21-28 days depending on conditions.

G4 Pond Sealer is an excellent sealer for brickwork, but below the waterline the brick should also be rendered. The reason is that while the G4 Pond Sealer is able to seal hairline cracks G4 Pond Sealer is not capable of bridging larger joints, cracks or holes.

G4 Pond Sealer Method of Application

Apply the first coat of G4 pond sealer by brush, a roller can be used but it is necessary to avoid puddling of the G4 pond sealer on the base, it is best to use a brush, allow the first coat of G4 pond sealer to become finger tacky ( like cello tape ) or dry enough to walk upon carefully, approximately 45-60 minutes depending on humidity, then apply 2nd coat of G4 pond sealer, when second coat of G4 pond sealer is finger tacky apply third coat of G4 pond sealer, no longer than 4 hours should pass between coats, if a colour is used, then use 2 coats of standard and 2 coats of colour, G4 pond sealer is mechanically hard after 24 hours but must be given 72 hours to chemically cure, after which the pond can be washed down with plenty of water, drained, and can then be filled.

We strongly recommend that you mix Black Knight Wizard Fibre or some similar fibre into the render mix. This will help prevent the frost cracking the render in winter and give additional strength to the structure.

G4 Pond Sealer Clear Application

Apply first coat of G4 pond sealer Clear by brush, a roller can be used but it is necessary to avoid puddling of the G4 pond sealer Clear on the base. Allow first coat to become finger tacky or dry enough to walk carefully upon, approximately 45-60 minutes depending on humidity, then apply the second coat of G4 pond sealer Clear. When second coat is finger tacky apply Third coat. No longer than 4 hours should elapse between coats. Normally 3 coats of G4 pond sealer Clear is sufficient to build a continuous surface film but on very porous substrates a 4th coat of G4 pond sealer Clear may be required, apply as instructed above.

G4 Pond Sealer Colour Application 

The system is slightly different. When using G4 Pond Sealer Colour the first two coats must be G4 Pond Sealer Clear. This is because G4 Pond Sealer Clear provides the maximum non-porous seal and adhesion.

Follow the application instructions as detailed for G4 Pond Sealer Clear but the last two coats will be G4 Pond Sealer Colour. G4 Pond Sealer is mechanically hard after 24 hours and workable on some 6 hours after final application. However, 72 hours must elapse for full chemical cure, before washing down the G4 Pond Sealer with copious amounts of clean water. This water should be drained off. The koi Pond can then be filled. Consumption of G4 Pond Sealer will vary slightly according to the porosity of the substrate.

G4 pond sealer Clear – 3 coats = 550g per sqm for the three coats (approximately 185ml per squ. metre)
G4 pond sealer Coloured – 2 coats of Clear = 410g per sqm for 2 coats (approximately 205ml per squ. metre)

G4 Pond Sealer is available in Standard Clear, Black and Green.

If rain is expected make provision for covering the coated area, since water can damage the G4 pond sealer during the curing process. As soon as it is superficially dry water should not affect G4 pond sealer

not rated £25.99£108.99 inc. VAT Select options
Cloverleaf Sludge Answer
Cloverleaf Sludge Answer

Cloverleaf Sludge Answer

Cloverleaf Sludge Answer is a unique blend of beneficial bacteria used to convert and remove sludge from the pond and filter system.

The accumulation of sludge within a pond or filter system means far more than just an ugly sight, such deposits not only erode important saturated oxygen levels ,but also become a breeding ground for pathogenic bacteria. Using nature’s natural range of bacteria.

Cloverleaf Sludge Answer is the safe way to biologically removing sludge and dead algae thus creating a cleaner pond and less filter maintenance, whilst promoting a sounder environment for the fish to enjoy.

Cloverleaf Sludge Answer is designed for frequent use throughout the year on established ponds, however it is also a first class product when used on an immature pond, and will greatly assist with filter maturity. For ponds with sludge problems, it is recommended that when applying Cloverleaf Sludge Answer it should be supported with lots of oxygen by using an air pump. For new or problematic ponds Cloverleaf Sludge Answer should be added at the rate of Use 100ml per 1000 litres (220gal) of pond water, with follow up doses (every 28 days or as required) at the rate of 150ml per 1000 litres (220gal)

The product should be mixed with 3 litres of pond water, and poured over the pond surface and into the filter system using a watering can.

“Sludge Answer” is the perfect follow up to the no 1 selling “Blanket Answer” to help reduce the residues left after application.

Use 100ml per 1000 litres (220gal) of pond water for the first application with follow up doses of 50ml per 1000 litres (220gal) every 28 days. Ultraviolet clarifiers should be turned off for the first 24 hours after each application.

£6.99£19.99 inc. VAT Select options
PH Acidity Test Kit
NT Labs PH Acidity Test Kit

NT Labs PH Acidity Test Kit

pH is the measure of the acidity or alkalinity of the water in your pond. Pond fish prefer the water to be between 7 and 8, fluctuations outside theses values can cause stress to the fish.

not rated £6.99 inc. VAT Add to basket
Hardness Test Kit
NT Labs Hardness Test Kit

NT Labs Hardness  Test Kit combined. GH measures general harness and KH known as total alkalinity measures the buffering capacity of water in your pond.

Comprises 80 tests

not rated £6.99 inc. VAT Add to basket
Nitrate Test Kit
NT Labs Nitrate Test Kit

NT Labs Nitrate Test Kit

Nitrate is produced by the beneficial bacteria in the pond and filters as they break down the fish’s toxic waste products (Ammonia and Nitrite). Nitrate is not toxic to pond fish.

This process forms the biological filtration system and is called the Nitrogen Cycle. Nitrate itself is relatively non-toxic, and will not cause troubles at low concentrations. However Nitrate can cause problems as the level rises.

Monitor the level of nitrate in your pond using a NT Labs Nitrate Test Kit on a regular basis. When the level becomes too high for your particular system perform a partial water change to lower the nitrate concentration.

Comprises 30 tests


£6.99 inc. VAT Add to basket
Blanket Weed Resolve
Blanket Weed Resolve

Blanket Weed Resolve

Blanketweed naturally becomes resistant to treatments after continued use and this is why Aqua Source’s new treatment will work when others fail, even at low temperatures.

Aqua Source Blanket Weed Resolve is completely free of Algaecides, 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, but 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.

Product Pond Size

Blanketweed RESOLVE 250g Treats 7,500 litres (1,650 gallons)
Blanketweed RESOLVE 500g Treats 15,000 ltrs (3,300 gallons)
Blanketweed RESOLVE 1kg Treats 30,000 ltrs (6,600 gallons)
Blanketweed RESOLVE 2kg Treats 60,000 litres (13,200 gallons)

Instructions for Use:

  • 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 re-occurrence.
  • 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.
£5.50£33.99 inc. VAT Select options
Kajaku 45cm kaneko


not rated £295.00 inc. VAT Read more
yamabuki ogon 42cm Hosokai

Verity: yamabuki ogon

Size: 42cm

Breeder: Hosokai

not rated £100.00 inc. VAT Read more