How Swimming Pool Sand Filters Work

How Does a Pool Sand Filter Work

A filter is an essential part of the swimming pool. Selecting the perfect pool filter may take more effort and time. The sand filter is one of the most compact and affordable pool filter which you can use for both above ground and in-ground pool pumps.

The process of the sand filter

These filters do not work without a swimming pool pump, so you should have both of these system elements to make the water of your pool get clean and crystal clear. The pool pump of the swimming pool pumps the water from the pool to the pool filter. The water of the pool passes through the skimmers, the underflow or overflow of the water to the sand filter known as the surface water. The pool pump even brings the water to the filter through the vacuum cleaner of the pool.

In case if you have got a skimmer pool, most of the time, these skimmer systems would have a filter basket or a pre-filter. They can trap the first large waste particles. You need to use the Net’Skim pre-filter bags to catch the large dirt such as the leaves, twigs, insects, so they would not get into the sand filter extending the durability of the filter.

When water gets to the sand filter that is pumped by the filter from the top to the end. The sand filter is full with a purification medium. Every time we select sand even though there are other alternatives available.

The water remains on the top of sand and leaks through that. The waste particles stick to the sand, and clean and fresh water gets out from the pool filter. After that, the water gets back to the pool, in some occasions it pass the heating system of the pool first.

The six settings of a sand filter

Most of these sand filters come with a six-port valve which has various settings. So let’s identify what each of these settings does.

  1. Pool filter- it is the duty of the sand filter, it purifies ninety-nine percent of the water in the swimming pool.
  2. Waste- the water passes throughout the sand filter directly, avoiding the sand. It is usually when the pool gets a lot of dirty, and it needs a deep pool cleaning. You need to remember that this setting would empty your swimming pool.
  3. Backwash- it is a small sand cleaning cycle to improve the purification. Just check the maintenance of the pool filter. Usually, you need to do this at least once per week. The pool water gets wash back along the sand in a reverse way, by removing the waste from the pool filter material.
  4. Rinse- it is the setting you need to use right after you do the backwashing. Let the water pass through the sand filter from the top to end for about thirty seconds, so the water gets drawn into the system of the sewer. It would make sure that all the sand is back in the right place and the remaining waste is drained out.
  5. Circulation- the water goes straight back to the pool from the pool pump without going along the filter. Eventually, this means the water is not fresh.
  6. Closed- every port is closed. In case, if the pool pump is still switched on, ensure that you turn it off within few seconds, or as a result, the pressure increases fast. Usually, you use this setting when you service the pool pump. By this way, water will not get back to the pool pump from the filter when you turn the pump off for a while

Maintenance of the pool filter of the swimming pool

You need to maintain your swimming pool filter regularly. Usually, it only requires a little bit of support. You need to purify your filter by doing a backwash once a week for around five minutes. After that, you need to set the pool filter to “rinse” so that it can wash away any remaining waste quickly.

After the five years, you would have to replace the sand in your pool filter. At that time, the upper layer of sand would be harder to penetrate due to collected matter. So the filter might get clogged, raising the pressure within the filter and minimising the flow rate of the filter. By not replacing sand to your pool filter, you might end up breaking it down entirely.