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/m3 of the circulation flow. (It is very important that it is not diluted with water as it will form a gel.)

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/m3 of the circulation flow.

What is a normal dosing rate for pwtag PAC?

PWTAG recommends a normal dosing rate of 0.1ml/m3 of the total flow rate, which it has also described as 0.005ml/m3 as aluminium. There are now a number of diferent grades of PAC with aluminium concentrations between 9.5% and 18%. The concentration of aluminium is not the only consideration when selecting a grade of PAC to use.

How should Pac be dosed in a peristaltic pump?

PAC should be dosed continuously using a peristaltic pump. All grades of PAC should be dosed at a rate of 0.1ml/m 3 of the total flow rate. PWTAG Technical Note released in February 2014 about polyaluminium chloride (PAC) dosing. Continuous coagulation with PAC is recommended by PWTAG.

What is a normal PAC dosing rate?

Different Grades of PAC: PWTAG recommends a normal dosing rate of 0.1ml/m3 of the total flow rate, regardless of the grade of PAC used. While there are various PAC grades available with different aluminium concentrations (ranging from 9.5% to 18%), aluminium content is not the sole factor to consider when selecting a grade.

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.