Pure Pool Supplies Calcium Hardness Increaser 2 Lb. (Calcium Up Calcium Chloride) Pool Spa Balancer

I just had my pool replastered, and needed to increase hardness despite the water in my area being very hard. None of the pool supply stores around Las Vegas carry this product and this was a great find. Worked as advertised and I was careful per instructions to not add more than 5 pounds at once. Very easy to use and brought by calcium readings up instantly. Thanks Pure Pool!

This did the job of raising my calcium hardness levels in my pool. It was not the freshest as it was a bit lumpy, I had to brush the pool a few times, but it was fine.

Easy to dissolve flakes. Used to increase calcium hardnesses of a spa/hot tub after a water change. Large bag so will be able to use for multiple refill's.

Just what I needed to increase my 305 gallon spa! Was able to weigh out the needed amount on a kitchen scale, dissolved it in a jar with hot water, before adding to the spa. My chemical levels are just where they need to be now!

I just used it today. We will see. Should of come with a scoop.

Have previously used granules which appear heavier than the flakes in this product . The flakes seem to dissolve faster than granules and would appear less likely to leave bleach spots on pool bottom. Good product...

Ordered this because my pool guy said our pool was calcium starved and was in danger of etching. Received super fast and It worked perfectly! Summer here we come!

I use them as a refill for damp rid and they do the job.