Pool Maintenance: Cartridge Filters.

Pool Maintenance: Cartridge Filters.

For more information on swimming pool Cartridge Filters contact Pool Companies Miami.

Cartridge Filtration is the newest form of filtration. The filter media is either spun-bonded polyester or treated paper in a cylindrical pleated arrangement. Cartridge filtration is accepted to be in the 15 to 25 micron range for the size of particles it will filter. Cartridge filters offer a compact design with a large area in a relative small foot-print. A cartridge filter usually will require about half the filter room area as a comparable sand or diatomaceous earth filter (DE). Cartridge filters are found on average residential pools and are utilized extensively for spa filters. Cartridge filter elements are considered replaceable. The normal life of an element is about one year. Several cartridge filter cleaning products are commercially available to clean cartridges and may extend their useful life.

Dirt, minerals, and oils can be driven into and through the filter element and back into the pool. Cartridge filters are much more affected by high water velocity than sand or D.E filters. Particles can become embedded so deeply in the cartridge that they are not released during cleaning.

Cartridges are used in swimming pools and to a greater extend to treat spas water. There are two basic concepts to cartridge filtration. The oldest is depth penetration filters, which were designed for a FMR between 3 and 8 gpm/ft2. The cartridge filter of today is a surface type with FMR between 0.375 and 1.0 gpm/ft2. Cartridge filters are considered replaceable media.

The depth penetration filters were called fabric cartridges. The surface filters are constructed of synthetic fabric in a pleated arrangement around a cylindrical or oval core.

In most cases, cartridge filtration is operated in the pressure mode. There are some commercial instances where cartridge filters have been installed in the vacuum mode, similar to a vacuum D.E system.

The most obvious reason for choosing cartridge filtration is its compact size. The normal installation will require about half the floor space of an equivalent sand or D.E system. Cartridge filters do not require back-washing to clean the cartridge so water is conserved. This is an advantage in cost saving. The disadvantage is using a cartridge filter is lack of dilution or replacement of dirty water with fresh potable water.

Water containing suspended material passes through the filter element, depositing the debris on the surface. As the cycle continues, more dirt is deposited, causing the passageways to become more constricted. Smaller and smaller particles are trapped as the process continues. The cycle continues until the influent pressure increases to 10 psi above the cycle starting pressure. Excessive water velocity has a greater negative effect on cartridge filtration that any other type. Debris can be driven through the filter and back into the return water flow and could damage the cartridge element.

Cleaning Cartridge Filters

Cartridge filters are not back-washed but are removed from the filter, hosed off, and cleaned. Shut off the pump and follow the manufacturer’s instructions.
If high water velocities or minerals build-up has occurred, then further steps are necessary.

• The element should be soaked in a commercial filter-cleaning product. It is important to review label directions since often two filter cleaners are needed. One removed oil and greases and another may remove scale deposits. The order in which the cleaners must be used may affect how the cleaners perform. Often grease cleaners must be used before acid cleaners. Failure to do so may result in the acid causing the oil materials to set into the cartridge media.

• After a through rinsing, any minerals can be removed with a light acid wash.

• Replace the filter element(s) back into the filter tank and secure the housing. Visually inspect the O-ring for wear before closing the housing. O-ring lubricant should be applied as necessary or once per month. Failure to maintain the O-ring can result in water loss or air entering the system.

Many operators eliminate downtime by keeping a spare cartridge filter element on site so that when one needs to be cleaned, it can be replaced with a clean cartridge. In some instances it is a code requirement to have an extra cartridge.

Leave a Reply

Message:*

Name:*

Email:*

Website: