How Do Hot Tub Filters Work?

​One of the most important components of hot tubs is its filters. The best hot tub filter system will keep the water clean even if multiple people are using it at a time. Like most filters, it works by trapping dirt so it will not recirculate on the water. Still, hot tub filters aren’t made equal. The following are some of the things you need to know:

​They differ on filter system type

Hot tub filters come in a variety of filter system types. Each type has a different configuration which filters out contaminants in different processes. There are two main types of filter systems:

Pressure type - In this system, the filter cartridge is much smaller and not usually found in most modern tubs. This system is much durable against pressure and does not require frequent maintenance.

Suction type - This filtration system is the most common type you’ll see on modern tubs. It’s mounted on the top of the tub so users will enjoy easy access. The trade-off here is that you have to perform regular maintenance to keep the filters functional.

​Filtration cycles vary as well

The filtration cycle of a hot tub refers to the amount of water that passes through its filters within a specific time. Usually, this is measured by minutes. The higher the filtration cycle is, the more efficient the cleaning process will be. Modern hot tub filtration systems can filter twice the amount of water than old models. 

Circulation pumps play an important role

A circulation pump is a secondary pump which is responsible for running small amounts of water to the filtration system. This is separate from the jet pump and main pump. Circulation pumps continue to run even if you turn the tub off. It keeps the water clean all day long instead of just letting the water stand. This pump is essential, especially if you can’t use your hot tub for several days.

​Control systems differ on each tub

Control systems are the portion you navigate to change the settings of the filtration system. It usually has panel anywhere on the tub so you can easily access the features of the equipment in a few clicks and press of a button. During heavier baths, you may need to increase the filtration cycle of the hot tub.
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With the control system, you can change the filtration cycle of the filters as well as turn the jets off. If your tub has a pH level control, the control system will also let you change the settings for that.

​Replacement/cleaning matters 

Most hot tub filters last for years. Still, you will need to replace the filter material to prevent the dirt from recirculating. If your tub has a paper filter, it should be replaced every 2 to 3 years, depending on its frequency.

Meanwhile, a more modern TRI-X Ceramic Filter can last for up to 6 years before it requires replacements.

Even if you are not replacing your filters, inspecting the filtration system from time to time is advisable.