Using Cal Hypo for the first time

by Teresa
(Cyprus )

It was recommended to us to use Cal Hypo in our pool, I believed this would replace our current chlorine tablets. But know I cannot get a chlorine reading with my test kit. Do I still need to add chlorine tablets? Thanks





Hi Teresa. Cal hypo does not replace tabs. We need to define what tabs are and what they do. They're meant to dispense 1 ppm FC per day so your FC doesn't bottom out.

This way it gives you a little time before adding enough chlorine to maintain the correct FC range. They're not meant to be the sole source of chlorine.

Liquid chlorine or bleach is really your best alternative for chlorine. It doesn't contain the side-effects like cal hypo does such as increasing the pH and adding hardness to the water. Many places have hard fill water so they should only use liquid chlorine.

Some may say it will bleach out a liner. But, if you add one gallon at a time, broadcast it around 1/2 the pool, then sweep afterwards, there's simply no chance of the liner getting bleached out.

If they cannot find it, then cal hypo would be the next thing to use.

Hope this helps and have a great Summer.

Robert

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What Type of Calcium Hypochorite does your chart refer to?

by G Berge
(CA, USA)

Is the dosage rate based on a 10% liquid concentration or the higher 65 to 68 concentration of the granular version.

What is the start up dose rate of 10% solution Calcium Hypochorite per 1,000 gallons

Thank you
Greg




Hi Greg. The charts are meant to be a baseline for superchlorinating your pool. Most cal hypo falls between 68 - 73% strength. But that is at full strength. When it hits the water, the pH and CYA come into play. Higher pH will reduce FC effectiveness, regardless of whether it's liquid or granular.

I'm not sure what is meant by start-up dose, but the baseline is 1 gallon of liquid chlorine at about 10% will increase a pool's FC 10 ppm per 10k gallons.

But again, we need to figure in the chlorine's effectiveness which can be determined from the aforementioned variables.

Hope this helps and have a great Summer.

Robert

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