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Filters and Multiport Valves

Pool water free from debris and other contaminants is important for maintaining swimmers’ health and safety, not to mention happiness. But the type of filter you need can differ depending on your filtration needs, financial situation and willingness to put time and effort into maintenance. Plus the quality of filtration depends on the size of the filter media; the finer the media, the higher the purity of water achieved.
    Here’s some information on the most common types of pool filters on the Australian market to help you decide which type is best suited to you.

     

    Sand/Media

    How it works: 

    Manufactured with high grade fibreglass and resins for durability, this filter will give you years of clean pool water. Depending on the choice of media, this medium filters out everything larger than 3 - 40 microns. Sand/media still remains the most popular choice on the market for their durability and simplicity in maintenance
     

    Pros:

     Durable and easy to clean, as it does not need to be disassembled like other types of filters
    • Filter’s multiport valve to give you control of water flow through the filtration circuit 

    Cons:

    Filter media needs to be replaced approximately every five years
    • Needs to be backwashed regularly, which can use a lot of water
    • Generally requires a larger installation space compared to other filter choices
     

    Cartridge

    How it works:

    Cartridge filters typically use four cylindrical accordion pleated filters to trap anything larger than 30 microns, traditionally making them a higher filtration level than sand filters. However, this option can come with some extra costs and maintenance.
     

    Pros:

    No need for backwashing, no backwash line is required
    • Generally requires less space for installation
    • As no backwashing is required, requires less water for maintenance, more environmentally friendly than other kinds of filters

    Cons:

    Unlike other filters, there’s no provision for backwashing; when the cartridge is clogged, it must be removed for cleaning
    • Needs to be disassembled and cleaned
    • Cartridges may need to be replaced more regularly than filter media, depending on level of use and care
     

    Diatomaceous Earth (DE)

    How it works:  

    Able to trap anything larger than 2 microns, this type of filter gives you the cleanest pool water out of the four types. Diatomaceous earth, the medium used in this filter, is made up of fossilized remains of a type of hard-shelled algae, and each grain has microscopic holes running through it to trap even the finest particles. DE filters have internal elements that become coated with DE. It is this ‘filter cake’ that strains dirt, dust, algae, and some forms of bacteria from the water.
     

    Pros:

    • Filters down to 2 microns
    • Large surface area requires less maintenance

    Cons:

    Needs to be backwashed as well, though not as often as sand filters
    • Costs to replace DE each time you backwash it
    • Time and effort to replenish the DE powder in the filter
     

    Glass Pearls

    How it works: 

    One of the newest filter media on the market, Glass Pearls offer a filtration level comparable to DE. Made from pure glass, the Glass Pearls filter out anything larger than 3 microns, giving you superior quality water.
     

    Pros: 

    Small effective size of only 0.6mm to 0.8mm. Its narrow particle size range allows very effective in-depth filtration
    • Spherical shape of beads means less friction levels inside the filter and therefore requiring only 20% of the water you would use to backwash a sand filter
    •  Chemically inert, safe, smooth and high purity

    Cons:

    • Still requires  backwashing occasionally
    • More costly than sand and Zeoplus
     

    Zeoplus

    How it works: 

    ZeoPlus is a naturally occurring mineral rock, found in areas where there has been historic volcanic activity. Its microporous structure and ammonia removal properties will significantly improve the quality of your swimming pool water. Ammonia is released in the water by bathers and when the ammonium ions mix with chlorine, chloramines are formed, producing a ‘chlorine’ odour as well as causing skin and eye irritations.
     

    Pros:

    • Superior water clarity to sand
    • Reduced chlorine demand, reducing ‘chlorine’ odour
    • Highly recommended for teaching pools and hydrotherapy pools and spas, where the tendency to build up ammonia by products is strongest

    Cons:

    • Still requires  backwashing occasionally
    • More costly than sand
    • Requires regeneration to continue to retain its ammonia removal properties

     
     
     

     

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