Converting to Chlorine

[Beth Torres]

I have a 18 x 33 x 4 1/2 ft pool. I want to convert to Chlorine from Namco's version of Baquicil. How should I start? I am also going from a sand filter to a Hayward cartridge filter. Should I install the filter first or try and clear the water? I would like to avoid
emptying and refilling the pool if possible.

 

[tnthudson]

We'll let the longtime members answer you, but my understanding is that you want to convert first, then change any filter media (or filter in this case) after the conversion.

 

[JasonLion]

First, adjust your PH to between 7.2 and 7.4, get a test kit that has the FAS-DPD chlorine test (such as the TF Test Kit or Taylor K-2006), and stock up on bleach.

The conversion proceeds by adding enough bleach to bring the pool up to 15 ppm, wait an hour or more, and repeat. Continue to do this as frequently as practical until your FC level stays the same overnight.

After the FC level holds overnight you replace the filter and then add CYA.

Keep in mind that the pool will turn all kinds of strange colors during the conversion.