JBL PhosEx 1Kg (Pond Phosphate Remover)

JBL PhosEx 1Kg (Pond Phosphate Remover)

JBL PhosEx 1Kg (Pond Phosphate Remover) for ponds up to 10000 litres.

  • Eliminates the basic nutrients of all types of algae, preventing the growth of unwanted algae.
  • Significant reduction of high phosphate levels after only 24 hours.
  • Effective for about 3 months.
  • For all pond filters with filter material container.
  • Includes net bag for individual dosage.
  • Does not release aluminium or other undesired substances.

Why are phosphate compounds not wanted in a garden pond?

Phosphor (phosphate), a vital plant nutrient, is lacking in natural waters (0.001 – 0.01 mg/l). Plants have adapted to this deficiency through long evolution and therefore need very little phosphor for growth. Phosphate is therefore a limiting (inhibiting) factor for plants and also algae growth in water. Accumulations of phosphate compounds, in garden ponds often up to 10 or 500 times the natural level, lead to an explosive increase in unwanted algae, particularly floating and thread algae, but also blue-green algae, to which bacteria belong. Regularly checking the phosphate content of the water using a Phosphate Test Kit PO4 is recommended. In the garden ponds, levels to a maximum of 0.05 mg/l can be tolerated.

Where do phosphor compounds in the garden pond come from?

Besides calcium, phosphor is the most important component of the skeleton of fish. Phosphor also plays a significant role in many metabolic processes, enzymes and other vital active agents, as well as in muscle work. Fish have to meet their phosphor requirements from their food. In industrially produced food, such as JBL´s pond food range, specially selected raw ingredients guarantee that this need is met. Some of the phosphor compounds ingested by the fish through their food are excreted into the water, enriching the pond water with phosphates.The second, often more significant source of phosphate in pond water is the waste plant material which accumulates in the water. In autumn this includes leaves, decomposing algae, aquatic and marsh plants, and in spring, however, the pollen from blossom, for example from birch trees, hazel, spruce or fruit trees. This particularly rich source of phosphates in spring should not be underestimated, as considerable amounts of phosphates are added to the garden pond at this time and can lead to algae problems. It therefore makes sense to take steps to reduce the phosphate level of the pond when the pond filter is started up in spring already, to avoid later increases in phosphate levels. JBL PhosEx Pond filter has been developed for this purpose. The granulate is contained in a net bag which can be placed in the clean water chamber, in the filter chamber provided for this (depending on the filter model), or between the last two filter materials.

How long is JBL PhosEx pond filter effective ?

A general time when the absorption capacity of JBL PhosExPond filter will be exhausted cannot be predicted , as the amount of phosphate compounds in a garden pond depend on many factors: young fish excrete a lower percentage of phosphate compounds than adult fish. High fish stocking levels cause more phosphate compounds in the water than lower ones. The seepage of phosphates into the garden pond from the local vicinity of the pond is a further unquantifiable factor. In garden ponds with dense, healthily growing aquatic plants and an extensive marsh area more phosphate compounds will be expended than in garden ponds with no plants or only a few plants. As a general guideline: In a 5,000 l gardenpond stocked with max. 20 cm fish per 1,000 litres water and not overfed, 500g JBL PhosEx Pond filter will be active for approx. 3 months. This means that up to 25,000 mg phosphates will be absorbed. This should be checked regularly using a Phosphate Test Kit PO4.

Example calculation: Pond volume: 5,000 l, measured phosphate content 0.2 mg/l, Target level 0.05 mg/l, required reduction 0.15 mg/l. Daily addition from pollen, food etc. 0.05 mg/l. Capacity 90 days, corresponding to 3 months.

5,000 l * 0.15 mg/l phosphate [reduction] + (5,000 l * 0.05 mg/l [phosphate addition] * 90 [days]) = 750 mg phosphate + 22,500 mg/l phosphate from daily addition = 23,250 mg/l phosphate to be absorbed.

How can excess accumulations of phosphate compounds in the garden pond be avoided?

Since the food of pond fish is one of the two main sources of phosphates accumulating in the garden pond, avoiding leftover food by feeding fish measured amounts of the correct food for the particular species is the best way to avoid an unnecessary accumulation of phosphates.
The second source of phosphates, that is natural accumulation from plants and pollen, cannot be permanently avoided and therefore measures to reduce phosphate levels are vital.


Before using the first time briefly rinse out the net bag containing JBL PhosEx Pond filter under running water to remove any particles of dust which unavoidably occur during transport. Place the net bag with JBL PhosEx Pond filter between the filter materials of your pond filter or, if available, in the chamber provided for special filter materials. Renew the JBL PhosEx Pond filter when increasing phosphate levels are measured..

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  • Brand: JBL
  • Product Code: JBL2737400
  • Dispatch Time: 1 day
  • Availability: In Stock
  • £22.99

Tags: Pond Phosphate Remover