Longlife Algaecide


Price request




WTP C90 is an Algaecide containing a copper active substance in the formulation.

WTP C90 is approved under the Biocidal Products Regulations No 528/2012 (BPR) for Product Type 2 application:

WTP C90 is used to maintain good water quality in private and public swimming pools by preventing and inhibiting algal growth.

Authorisation Number: UK-2018-1126-1


  • Repeat treatment algal protection.
  • Effective dosing for up to 6 months (with maintenance dosing).
  • Protection against green and blue-green algae.
  • Can be used all year round.
  • Effective treatment for up to 6 months in the winter season. Maintenance dosing may be required when the Copper reading has reached 0.4 mg/L (ppm).

Trade Names



Physical State Clear blue solution with mild ammonical odour
pH 7.8-8.2
Specific Gravity (SG) 1.1 g ml-1 + 0.02


Algae growth in pools proceeds when a low free chlorine availability is present. The common cause being incorrect pH levels or high levels of chlorine stabiliser in the pool water. Green algae (chlorella) is the most prevalent strain in the UK. Chlorine will kill most algae but if levels are low, or the water has out of balance the growth of algae escalates. In a balanced pool with chlorine available, the algaecide supports the chlorine action by preventing growth of algae. Algaecides reduce the amount of sanitiser required, enhancing the efficacy of chlorine treatment. Small amounts of algaecide should be dosed throughout the season to prevent growth build up of algae and the subsequent problems.

Treatment and Dosing


  1. Ensure bathing has ceased before applying this product.
  2. Adjust pH to 7.2
  3. If algae is present prior to application it is recommended this is cleared before application. To clear the algae, shock dose with unstabilised chlorine shock.
  4. Run filtration for 24 hrs
  5. Add product directly to circulating water.
  6. Maintain pH reading between 7.2 – 7.6
  7. Bathing can resume after one full turnover of the swimming pool water, typically 4 hours.
    Dose at the rate of:
    1lt of WTP C90 will treat 33,000 lts (7,250 gallons) of pool water to obtain 1mg/l (ppm) of copper. It is recommend to add a “top up” dose of WTP C90 around July, check copper levels with a test kit and top up with WTP C90 at 0.9lt per 50,000 lts when the reading has reached 0.4 mg/l (ppm) to a target reading of 1mg/l (ppm).


A Copper (WTP TK189) test kit can be used to ensure levels are satisfactory


Use biocides safely. Always read the label and product information before use. Please refer to material safety data sheet for detailed handling/storage instructions. Avoid direct contact with skin, eyes and respiratory system.

Handling and Disposal

  • Always ensure bathers are out of the pool when adding chemicals.
  • Never mix with any other chemicals including cleaning product, weed killers and chlorine products, as a dangerous reaction may occur.
  • When emptying water from the swimming pool ensure copper levels have dropped to 0.4 mg/l.
Please refer to material safety data sheet for detailed handling/storage instructions.


WTP C90 treatments are shipped in 10 litre, 25 litre and 200 litre non-returnable drums.


Field Representatives will work closely with customer personnel to assure the effective application of the water treatment programme. Regular service calls can be provided by qualified personnel.

More Information

To enquire further about this product click here

The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The company shall not be held liable for any damage resulting from handling, contact, mis-use or mis-application of the above product. In all instances the user should satisfy themselves that this product is suitable for the anticipated application and should carry out suitable and sufficient risk/COSHH assessments and a method of use statement.

Copyright © 2010 - 2021 Water Treatment Products Ltd, All rights reserved.

Designed and built by Big Eye Deers