Vitamin C-based dechlorinators are more expensive than sulphur-based products.
You could ask the pool professional, “Is there a carbon-based filter that would work well for my pool?”
If your pool contains 5000 gallons of water and the total chlorine is currently 50 ppm, you’ll need to add 1. 56 pounds (. 7 kilograms) of sodium thiosulfate. Use an online dechlorination calculator to determine how much sodium thiosulphate to use.
DPD test kits use a comparator. A comparator allows you to compare your sample to color standards. You put your sample in the slot and then compare the color to the standards on the side of the instrument. A colorimeter is an instrument that uses white light to determine chlorine levels. It is a separate instrument, which won’t be included in standard DPD test kits. Test strips can also be used to determine chlorine levels. They are the simplest and cheapest option.
If you are inside, you’ll need to establish lighting that is as close to daylight as possible.
Although not as accurate as a DPD test using a comparator or a colorimeter, test strips will give you a good enough reading in most situations.
If the chlorine level is not acceptable, you can let it naturally dechlorinate for another couple weeks, or use a chemical method.
