Who is pool water treatment Advisory Group (pwtag)?

Pool Water Treatment Advisory Group (PWTAG) | 789 followers on LinkedIn. UK-based independent, non-commercial membership organisation, dedicated to raising standards in pool water treatment. | Our work over the last 35 years has made us the authoritative source of standards and guidance in the management of swimming, spa and hydrotherapy pools.

How do I optimize the dosing of PAC in swimming pool systems?

Summary: To optimize the dosing of PAC in swimming pool systems: Administer PAC as far before the filters as possible and after the chemical controller's sample point. Utilize a peristaltic pump for continuous and accurate dosing. Maintain a consistent dosing rate of 0.1ml/m3 of the total flow rate, irrespective of the grade of PAC used.

What is the coagulation removal rate of polyaluminium chloride (PAC)?

Without coagulation removal rates in a single pass of a medium-rate filter were about 50%. This was dramatically improved, to over 90%, by dosing polyaluminium chloride. PAC is directly and continuously dosed from the containers in which it is delivered at a rate of about 0.1ml/m 3 of the circulation flow.

How does polyaluminium chloride coagulation work?

Continuous coagulation with polyaluminium chloride has long been recommended by PWTAG – especially in the light of the threat from Crytposporidium. Like all coagulants PAC works by extracting and then clumping together dissolved, colloidal and suspended matter. The resulting floc is then trapped on the filter.

How is polyaluminium chloride dosed?

This was dramatically improved, to over 90%, by dosing polyaluminium chloride. PAC is directly and continuously dosed from the containers in which it is delivered at a rate of about 0.1ml/m 3 of the circulation flow. (It is very important that it is not diluted with water as it will form a gel.)

What is the PAC dosing rate for a 450m3 pool?

Dosing Calculation: For pools with a capacity of 450m3 (100,000 gallons) and a turnover period of 2 hours, the circulation rate is 225m3 per hour. Therefore, the PAC dosing rate for this pool would be 22.5ml per hour. Although a small quantity, accurate and continuous dosing can be challenging.