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SGP Blue is the perfect Blue Pond Dye to apply to your pond or lake water which will disrupt the process of photosynthesis. 

SGP Blue 50: 1ml is required for each 150 litres of water

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Save time with SGP Blue

  • When there is an abundance of resources available in a garden pond, it is the plants that benefit first. This is especially true of nitrogen, which is a very useful component to plant life
  • Garden pond owners can experience what's called an algal bloom when resources are plentiful. This means that algae reproduce in record numbers, consuming larger and larger amounts of the resources available.
  • Algal blooms could lead to overproduction, which will kill other pond life, both other plants and fish.

SGP Blue is harmless to fish

Manual algae prevention can be hard work and is not always practical. The use of chemicals, algaecides, herbicides etc, if not used in precise doses or under strict supervision by experts, can cause an imbalance of the natural nutrients in the pond. This may have a negative effect on fish, plants and other species.

Dyofix SGP Blue is an extremely economical solution for preventing algae in garden ponds and small lakes.



Features and benefits

  • Works in all garden ponds and small lakes
  • Very economical to use
  • Simple application methods
  • Saves time and effort
  • Blocks light, denying algae's food source.
  • Lasts up to three months
  • Free of pesticides and herbicides
  • Harmless to plants, fish, filters and wildlife
  • All year round use




Instructions for applying Dyofix SGP Blue

Calculate the volume of water in the pond. Half fill a watering can with pond water and add the measured amount, stir the contents. When mixed, apply to different parts of the pond. SGP Blue 15: 1ml is required for each 50 litres of water SGP Blue 50: 1ml is required for each 150 litres of water SGP Blue 100: 1ml is required for each 300 litres of water Please note: The water will look to have more colour in the first few days because it takes a little longer to mix from the top to the bottom. To maintain the level of DyoFix in the water, as a general guide, add 10% of the original dose monthly. The first application should be made in early Spring.

Reference Samples

If reference samples are desired, it is suggested that these should be taken at least a week after the initial application. Samples should be in clear containers with a secure lid, labelled with the date and location and stored in a dark place. An initial comparison to tap water will show the amount of colour present in the water. Dyofix products are propriety blends of European Food Approved colours and do not pose any threat to humans, animals, fish or insects etc.


How it works, the science in a simple form

What is daylight?

  • Daylight (or white light) is made up of a series of colours, collectively referred to as a spectrum.
  • This is known because when a beam of white light is passed through a glass prism; the white light splits into seven visible colours with red shades at one end through to blues and violets at the other.

Filters block colours

  • When a white light source has a coloured filter placed over the beam the observer will then see the light as a colour, i.e. a green filter shows as green - blue as blue, etc.
  • It is useful to realize that when white light hits the filter, the other colours are being blocked. The filter is allowing only certain colours of the spectrum through.

Dyofix blocks the red end of the spectrum

By adding DyoFix to water, a filter is being created to block colours from the red end of the spectrum getting through to the bottom of your pond or lake.

How does this help?

Photosynthesis needs red light

All plants, surface or submerged use the process of photosynthesis to thrive and grow and the whole process relies on red light to drive it.

By adding a filter to the pond or lake water you are blocking some, or all, of the red light and the process of photosynthesis is interrupted, with the result of little or no further growth.



A little about Photosynthesis

  • All green plants need sunlight for their reproduction, the energy from sunlight acts upon a green pigment (chlorophyll) which combines with water and carbon dioxide from the local environment to produce sugars and oxygen. Chlorophyll absorbs red light (centred about 650nm). Leaves look green as blue and yellow are main colours reflected by chlorophyll.
  • Photosynthesis is the manufacturing of sugars from carbon dioxide and water, in the presence of chlorophyll and light energy. Oxygen is then released as waste from the process.
  • The light source used for photosynthesis is natural daylight. It is this element of photosynthesis that can be manipulated to stunt the growth of algae and submerged weeds.
  • In a pond containing clear water, light easily passes through and any plants or nutrients present use this to grow. Plants get taller and grow towards the surface and single cell organisms (such as algae) start to float towards the surface. It is the floating, or suspended cells that can make the pond water take on the "pea green soup" look.
  • By preventing some of the light from reaching below the surface of a pond, photosynthesis is interrupted in deep-lying pond life such as algae. However, surface life such as lily pads or reeds, which photosynthesis either on or above the surface of the water, will not be affected. As it is not practical or desirable to have ponds built indoors or permanently covered, it has become necessary to develop another way of preventing the light from reaching the base of the pond.

  • prism-glass-1.jpg

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SGP Blue is the perfect Blue Pond Dye to apply to your pond or lake water which will disrupt the process of photosynthesis. 

SGP Blue 50: 1ml is required for each 150 litres of water

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