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What Are Backwashing Filters and How Do They Work?
Monday, February 24, 2020

Everyone uses water filters nowadays. You want to make sure that your water is clean no matter what you're using it for. For example, pools, aquariums, irrigation systems, or your home may need to be filtered.

It isn't enough to have only the filtration system. Filtration systems are a lot of work, and you want to ensure you're making a good investment. You'll want a backwashing filtration system so you know you'll have the cleanest water.

Yet, what is a backwashing filtration system? Below, we'll review what backwashing filters are and what they do.

Backwashing Filters

A backwashing filter will collect any particles that flow through your water. The backwashing filter's main components are a tank and the filtering media. As water flows through the tank, the backwash system will reverse the flow and drain it out of the filter media.

Next, it will use compressed air to suspend any particles in the filter media. This suspension prevents the particles from leaving once the water begins flowing again.

In essence, backwashing helps reverse the flow of water while increasing its velocity. This pushes the particles away from your clean water.

Filter Media

The filter media will trap any particles that enter your water system. This filter can be made from a variety of materials. For example, sand, crumb rubber, and crushed glass or granite are a few filter options.

Depending on your needs you can get multi-media filters. This type of filter media will layer different materials to filter your water. Generally, you'll use this method if one type of material can't keep your water clean.

The type of filtering media used will determine what particles your system removes. For example, certain filters can remove iron, chlorine, sulfur, sediment, or other contaminants.

For regular filters you'll need to clean the filters as the pores of the filter will become clogged. When you have a backwash system in place, it removes the need to regularly clean the filter.

Backwash Monitor

When backwashing, there is generally some water loss. You'll lose about 2-3% of your water annually. As this can be an issue, using a monitoring system that has sensors can help. You'll learn how clean your water is and help prevent water loss.

The sensor does this by measuring the media level and regulating its expansion. It helps clean your water by pushing the filter media to collide with the upward flowing water. This allows the filter media to scrub out any unwanted particles.

If the expansion rate is too low you won't properly clean the filter leading to water loss. Then again, if the expansion rate is too high the filter media could escape through the filter.

Do You Need a Backwashing Filter?

Now that you know more about backwashing filters, it's time to decide if they're the right choice for you. There are many types of filter media, so make sure you're getting the product that works best for your needs.

If you're unsure what you need, reach out to one of our experts today to learn more.