Understanding Sand for Sand Filters

Sand filters are the most popular types of filters. They are cost effective, easy to install and maintain and fairly simply to use. The only drawback is that they occupy a lot of space and have a limitation on the size of the particle they can filter. Also, they are prone to clogging and require regular cleaning.

Understanding sand for sand filters is important in case you’re considering buying one for your pool, or even if you have one installed in your pool. This blog will throw some light on the features and characteristics of the sand used in a pool sand filtration system.

Basically, the sand in a pool sand filtration system is not just any normal sand. It is specifically designed to filter debris and other particulate matter above a certain size. This is achieved with the help of the fixed granular size of the sand. The typical size of the sand is between 45 to 55 millimeters and the research has found that the sand can filter particulate matter of size as small as 20 microns. However, debris of size 100 microns or above might cause problems for the sand and thus there is a mechanism where the larger debris are trapped before they reach the sand filtration system by larger screens.

Now the sand has to be back flushed from time to time to filter out all the collected debris. The sand also experience weathering, so when it becomes too fine to perform the filtration it needs to be replaced. Also, if there is too much debris like leaves, oil, hair and other such larger debris then the sand might not be able to clean itself even after back flushing and in that case, too, it has to be replaced.

The water pressure needs to be monitored from time to time. If the sand becomes clogged, the pressure will begin to increase and then it has to be backwashed. Periodic backwashing also helps the filtration system to perform at its peak. If the system is half plugged then the efficiency of the filtration system goes way down.

The life of the sand inside a normal pool filter is said to be about 7 years. However, this largely depends on the other factors too, like the environmental conditions and, as mentioned earlier, debris type like leaves, oils and lotions and hair. These types of debris decrease the life of the sand while keeping it cleaner may increase the life of the sand too.

Keeping a log book about the pressure of the water, keeping a watch on the clogging and regular backwashing may go a long way in increasing the effectiveness, efficiency and longevity of the sand in sand filters.

Keeping a pH balance and improving the overall quality of the water that is used in the swimming pool will also help in increasing the life expectancy of the sand and to keep the filter operate properly. As is the case with any equipment, following the instructions of the manufacturer will also improve the longevity and performance of the filtration system.

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