For those new to the pool industry, the following is a brief explanation of how sand filters work. The pump extracts water from the pool and pushes it into the filter. Water enters through the marker valve, travels through the diffuser and then through the sand bed. As water passes through the sand, debris is trapped between the sand particles. Because industrial sand filters extract turbidity from the incoming water flow, the filter will show a high-pressure drop through the bed. Because of the gravitational pull, water flows down through a bed of sand in a container about 3 feet deep from top to bottom.
The recommended and usual filter depth is 0.9 to 1.5 meters. The microbial layer is formed within 10 to 20 days after the start of surgery. The regeneration procedure for slow sand filters is called scraping and is used to mechanically remove dry particles in the filter. However, this process can also be carried out underwater, depending on the individual system. Another limiting factor for the water to be treated is turbidity, which applies to slow sand filters defined as 10 NTU. Slow sand filters are a good choice for budget operations, as filtration uses no chemicals and requires little or no mechanical assistance.
Crushed rock is the best type of filtration sand, as it is less likely to become contaminated with pathogens or organic matter. Grains of sand formed by water (i.e. river sand and beach sand) are rounded and uniform in size. Silica filter sand, or silica sand, is especially suitable for capturing very small particles. This is the type of sand your filter needs to properly clean your above-ground pool. It’s usually sold in £50 bags and can be found in every pool shop. Water filters remove chlorine and other contaminants to give you better tasting and smelling water.
The sketch illustrates the general structure of a quick-pressure sand filter. It sits on the floor of a nozzle or on top of a drainage system that allows filtered water to escape. Pre-treated raw water enters the filter chamber at the top, flows through the filter media, and effluent drains through the drainage system at the bottom.
A sand filter is essentially a tank filled with sand that is connected to your pool’s filtration network. As pool water passes through the sand tank, the sand catches debris and particles and prevents them from returning to the pool. In this article, we’ll examine sand filters in detail to help you decide if it’s the right choice for your pool before investing in it.
Sand filters are usually the most economical and commercially used pool filters. People often wonder how sand filters work, as they don’t have patterns or fins to support aquarium sand filter the filtration process. This setting also bypasses the filter altogether, but instead of pouring the water into the waste, it circulates back into the pool.
Sand filters are relatively easy to maintain, but still require some practical work. Once it reaches the top of the filter, it is sent to the waste (meaning it is removed and not back in the pool). Backwashing can be completed within minutes and is not a laborious or time-consuming process.
This configuration is basically used after rewinding or after replacing the filter media of the sand bath. What this does is that the water comes out of the top, as does the filter setting, but the water is still expelled through the side/back gate. This allows the sand to be pushed down and compacted so that it filters the water well. Skipping this step will leave you with loose sand and your filter may lead to a good minute of spitting sand into your pool. When it’s time to replace your sand filter with a new unit, make sure you get the right size and set the new filter according to the manufacturer’s instructions. Equally important is that you adjust the new sand filter to the flow rate of your pool pump.