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Hydra Blue Water Dye (Powder)

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Blue water dye in concentrated powder form that dissolves instantly without leaving residues. Gives long lasting natural blue finish to ponds and lakes. Thwarts algal blooms by blocking UV light and saves fish from predators by hiding them under coloured water.
Shelf Life of 3 Years
Name RRP Price Qty Add to Cart
Blue Water Dye (Powder)-250gm treats 1,437,500L £20.85
SAVE £2.00

RRP Price: £20.85

SAVE: £2.00

Blue Water Dye (Powder)-500gm treats 2,875,000L £41.70
SAVE £9.00

RRP Price: £41.70

SAVE: £9.00

Blue Water Dye (Powder)-1Kg treats 5,750,000L £83.40
SAVE £30.65

RRP Price: £83.40

SAVE: £30.65

Blue Water Dye (Powder)-5Kg treats 28,750,000L £417.00
SAVE £230.25

RRP Price: £417.00

SAVE: £230.25

Blue Water Dye (Powder)-20Kg treats 115,000,000L £1,668.00
SAVE £1,210.00

RRP Price: £1,668.00

SAVE: £1,210.00



Features & Advantages

  • Available in concentrated powder form.
  • Three times stronger in comparison to liquid dyes.
  • Mixes quickly in the water with no undissloved lumps left behind, spreads across the water within minutes to give natural blue finish and shadow effect.
  • Greatly add to the reflective quality of the water in lakes, ponds or water features.
  • Coloured/dyed water provides beautiful background for the water plants adding to the aesthetics of your garden ponds.
  • Food based constituents.
  • No harmful herbicides and pesticides.
  • Safe on filters, ornamental lilies or other water plants.
  • Very low quantity enough to give desired effect without harming fish, pets or visiting animals.
  • Aquatic life remains safely hidden away from the predators under the dyed water.
  • Acts as an effective algae inhibitor by preventing sun rays from entering deep inside the water where algae and weed grow.
  • Widely used in leisure Lakes, Angling Clubs, Golf Clubs and by Local Authorities and Fish Breeders.
  • A pair of protective gloves supplied with the dye to save you from staining while handling the concentrated product.


How To Use

Usage Rates

  • 250g of Hydra Blue Water Dye treats 1,437,500 Litres of water.
  • 500g of Hydra Blue Water Dye treats 2,875,000 Litres of water.
  • 1000g (1 kg) of Hydra Blue Water Dye treats 5,750,000 Litres of water.
  • 5 kg of Hydra Blue Water Dye treats 28,750,000 Litres of water.
  • 20 kg of Hydra Blue Water Dye treats 115,000,000 Litres of water.

Depending on water depth and colour density required.

Normal dilution rate is: 1kg of Hydra Blue water dye for every 1 acre of water with the depth of 1 meter.

Dilution rate may vary according to the original colour of water and the desired depth of colour.

Retreat every 3 months to maintain the colour.

Full instructions on the label.



Hydra Blue Water Dye adds natural and vibrant shine to the water body, transforming a normal water front to an aesthetically appealing view in your garden or outdoors. Apart from hugely enhancing the beauty of ponds or lakes, pond colorants also inhibit photosynthesis process of weeds and algae causing existing algae to die and hindering newer growth. The water bodies coloured using pond blue dye retain colour for months with re-application usually not required before 3 months.  Use Hydra Blue Water Dye towards the end of February to stop algae infestation at the very beginning of the season.

Hydra Blue Water Dye is ideal for use by fisheries, angling clubs and in water traps on the golf courses. These water bodies are often situated near the fields that receive fertilizer treatment. The water runoff from the fields when reaches lakes or ponds provide perfect breeding ground for algae blooms and green water. Using a blue lake dye prevents algae to use nutrients by hindering photosynthesis due to deflection of the UV rays right at the water surface. Algae and weeds that usually grow inside the water are unable to make food in the absence of sunlight below the water and thus do not flourish.

The reflective property of dyed water greatly increases, giving lakes or ponds a vibrant look and stunning background for the ornamental aquatic plants.

Additional Information

Manufacturer's Suggested Retail Price No

Products Questions:

Posted by Kevin ring on Wednesday, 8 October 2014


Is it completely safe for fish?


  • Posted by Kate Griffins on Wednesday, 8 October 2014

    Blue Water Dye is completely safe for aquatic lives and other plants.

Posted by thomas on Friday, 30 May 2014


how many sachets do you get in the 250 g packet


  • Posted by Simon Reid on Friday, 30 May 2014
    Blue water dye powder have no sachets, it is 1 pouch of 250 gm.
Posted by on Tuesday, 21 January 2014


I have a beautiful garden with a stone water feature/ a fountain which aereates the pond. Would pond dye stain the fountain too?


  • Posted by Aj Edgar on Tuesday, 21 January 2014

    Water dyed with Hydra water dyes does not stain you, the pond liners, fish, plant leaves or animals. However the concentrated product should be handled with precaution using protectives gloves.

Posted by on Monday, 9 December 2013


Someone advised me to use pond colourant to keep away algae and weeds. How adding colour to the water help to prevent algae?


  • Posted by Aj Edgar on Monday, 9 December 2013

    Pond dyes not only give a beautiful finish to the water body but also block sun rays from entering deep inside the pond. Most algae and weeds are submerged in the water and preventing the sunlight (essential for photosynthesis) starves the existing growth and prevents new development. Pond dyes also hide your precious fish from predators such as heron or visiting cats and pets.

Posted by on Wednesday, 4 December 2013


Would the dyed water leave marks on my skin if I come in contact with the water?


  • Posted by Aj Edgar on Wednesday, 4 December 2013

    Water dyed with Hydra water dyes does not stain you, the pond liners, fish, plant leaves or animals. However the concentrated product should be handled with precaution using protectives gloves

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Customer Reviews

Hydra blue Dye
"A very good product but beware mix a small quantity at a time not like me have enough mixture for at least another 2 application."
Review by Harrison
Excellent product
Works a treat, I have had lots of problems in the past with blanket weed but after using the dye the blanket weed has been kept at bay. Anyone having problems with blanket weed should use this product. Just dont get it on your hands or on anything else as it stains forever.
Review by Bradley
Excellent - but be careful
"I thought I'd done everything right with this powder - I read the reviews telling me to be careful, I worked out cubic measurements of pond water, donned plastic gloves and apron and then proceeded to put into pond. Bag came with plastic gloves and a scoop. I carefully loaded scoop, made sure there was no wind and then carefully spinkled on edge of pond. Then watched as the water turned deep turquise and the pond edging turned blue where invisible amounts of powder blew back. I had to rush to get the stones cleaned before they stained for good and then saw my gloves, broom, bucket, shoes and water butt and clothes turn blue when moisture hit the tiny spots as well. VERY powerful stuff and it was obvious that a scoop was just too much powder.

Still, very, very effective against the blanketweed which had nearly taken over in a large pond in the house we have just bought.

Just seen baby fish in there as well so the colouring has not affected them.

Very pleased with powder for the price and after it dies down a little bit I'm sure the colour will be lovely - I will just ensure that I put less in next time."
Review by Sam
blue lagoon
"We dug our pond, lined it and then filled it with water and put a bit of this blue dye in and it started to look like a little blue lagoon straight away. Only thing I would be careful of is we have white stones in the middle of our pond and some of them have turned a nice hint of blue. They look good still but be careful when you put the dye in as it does colour whatever it touches. do not use it on a windy day or youre asking for trouble
Review by Toby
Perfect, doesn't harm the fish as instructions clear, it works well on a number of ponds at Arundel Castle where its used!
Review by Gunnar
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