What is the pool water treatment Advisory Group (pwtag)?

Click here to email us. PWTAG. The Pool Water Treatment Advisory Group is a non-commercial membership organisation dedicated to raising standards in pool water treatment in the UK.

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.

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 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.

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.)

Why do all UK pools follow the pwtag code?

For this reason all UK pools are heavily encouraged to follow it. The Code provides a model of operation based on the authority of PWTAG good practice. Following this code gives an assurance to operators and to the public that the pool meets essential healthy pool operational standards.