Firstly, granular chlorine is easier to handle and store. It comes in small, pre-measured bags or sealed containers that you can simply toss into the pool. On the other hand, liquid chlorine is much more hazardous to handle due to its highly corrosive nature. Handling liquid chlorine requires special storage, safety equipment and handling procedures. Since granular chlorine is in a solid state, it is easier to handle if there is a spill. Liquid chlorine will react immediately due to the fact that it is already in a liquid state. It will ruin clothing, decking, vehicles used to transport it and will cause chemical burns if it comes in contact with skin.

Secondly, granular chlorine is more stable than liquid chlorine. Liquid chlorine starts to lose its effectiveness as soon as it is exposed to sunlight and air. This means that you need to use it within a few days of purchasing it, or else it will become less effective. To put it in perspective, liquid chlorine has an available chlorine content of 12% when it is shipped to a dealer. By the time it gets to your pool, the available chlorine content is around 8-10%. Within 30 days, the available chlorine content has dropped to 5%. Granular chlorine, on the other hand, is much more stable, has a higher available chlorine content and has a longer shelf life.

Thirdly, granular chlorine is more cost-effective in the long run. While liquid chlorine may be cheaper upfront, you need to use more of it to achieve the same level of sanitation as you would get with granular chlorine. Over time, the cost of using liquid chlorine can add up, making granular chlorine a more cost-effective option. Due to its highly corrosive nature, liquid chlorine will also cause irreversible damage to the pool surface and equipment such as pump seals and heat exchangers. Not only do you end up spending more money to chlorinate your pool, you will need to purchase replacement equipment and pool liners more frequently.