Dyofix logoLake and pond colours

Dyofix Products FAQs and Data Sheets

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Image showing how sun light is absorbed through water

SGP Blue and Pond Blue

Applying SGP Blue and Pond Blue to your pond or lake water will disrupt the process of photosynthesis.

The result will be little or no further growth by submerged plants.

Applied at the recommended rate pond water will have a very faint, almost imperceptible, tint of blue to the naked eye.

If weed growth is in an advanced state it may be necessary to add more Dyofix product to the water. This will not render the water unsafe but the blue tint will be more obvious.

SGP Shadow and Lake Shadow

Our Shadow blend reflects the primary colours (in equal amounts) and appears to the naked eye as being colourless because it allows some of the visible light to penetrate the water.

In reality, if treated water was compared to clear water, a very faint tint of grey would be observed.

If more and more Shadow is added to the pond, the water will get darker and darker.

Pond Black

Used in smaller ponds where the desire to halt algae and weed growth is important. Principally however, Pond Black is used for aesthetic purposes.

Pond Black is designed to absorb/block ALL daylight, allowing none to penetrate below the surface, hence the black appearance.

Plants with leaves and flowers above the surface of the water are not affected by the use of Dyofix Pond Black.

Like all Dyofix products, fish are safe in this environment but the product will darken the surface of the pond making it impossible to see them.

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.

If you need any assistance please email our sales department or telephone sales by dialling 0113 256 4251.