Why Calcium Builds Up in Pool and How to Get Rid of it

Dirty swimming pool water and pool edge

Calcium build up is a fairly common problem in swimming pools, but the good news is that there is a fairly simple solution to it! Aquaman Pools’ experts breaks down the basics on calcium in the pool and how to get rid of it.

First of all, how can calcium buildup be detected? Generally calcium buildup shows itself in the way of hard white deposits along the pool’s tile, walls and other surfaces. Otherwise known as scale, these buildup deposits are the result of chemically imbalanced pool water. High calcium hardness (which can also cause the pool water to become cloudy), high pH (more than 7.8) or a high alkalinity (above 120) can cause scale. If the calcium level is higher than 400, scale can not only form on the pool and equipment, but it can also lead to cloudy water. Temperature changes in the water along with rapid water evaporation can also be to blame if scale deposits to form on the pool.

There are two different types of calcium compounds that can form on the pool’s tiles or surface. Calcium carbonate creates white flaky scales that can be removed fairly easily. Calcium silicate forms harder white gray deposits that take longer to build up. Once they are detected on the pool’s sides and tiles, it’s possible that have already formed in the pipes and pool’s filtration system.

Test strips can help a pool owner determine whether the water is imbalanced so they can reestablish a balanced status. There are many scale removal products that might reduce or eliminate scale, but the help of a pool service professional may be needed to remove the calcium buildup. Partial draining and refilling may be required.

Preventative maintenance is the easiest way to deal with scale and prevent it from forming again. Keeping the pool water balanced is essential for this. Pool owners can test the water weekly with test strips to check the calcium hardness, pH and alkalinity.

While calcium buildup is a frustrating problem, homeowners should understand that it’s a very natural part of pool ownership. Staying on top of the issue can help it from becoming a major problem. That’s why it’s a good idea to remain diligent when it comes to pool maintenance. Sweeping and scrubbing the pool and checking the chemical on a regular basis can help mitigate scale buildup. Keeping a close eye on the pool and taking care of scale at the first sign of buildup can also keep it from becoming a major problem that might require the use of a scale removal service.