Maintaining a public or community swimming pool in good condition requires constant attention, as the water’s hygiene and quality must be guaranteed at all times. One of the most important aspects of pool cleaning and maintenance is choosing the right filter . Selecting the correct filter can be a bit overwhelming, as there are several types available on the market. In this article, we’ll discuss the three main types of pool filters : sand filters, cartridge filters, and diatomaceous earth filters, and help you determine which is the best type of filter for public or community pools .
It’s worth mentioning that each type of filter has its pros and cons, and the best type of filter for a pool will depend on a variety of factors: size, usage level, budget, etc. Shall we begin?
SAND FILTERS: DURABLE, ECONOMICAL AND LOW MAINTENANCE
These are the most commonly used types of pool filters, and as the name suggests, they are characterized by having a layer of sand that traps impurities from the water. This sand layer can be silica , the most affordable; active glass , with greater filtering capacity, recommended for achieving the best water quality and for pools with algae problems; or zeolite , the most effective and expensive filter, a volcanic rock that can improve chlorine balance.
The pool water is pumped through the filter, trapping the dirt as if it were a sieve, and then the clean water is returned to the pool. The advantages of this type of filter? The filter media lasts from 3 to 5 years depending on usage, they are inexpensive , and require little maintenance , which is why they are a preferred option, even for large pools such as public or community pools.
CARTRIDGE FILTERS: SUPERIOR FILTRATION AND EFFICIENCY
This type of filter uses replaceable cartridges that last up to a year and require frequent and thorough cleaning to maintain their effectiveness. The pressure gauge needle, which measures the pressure, will indicate when cleaning is necessary; a high needle means the filter is dirty. A downside to cartridge filters? Perhaps the cost of replacing the cartridges, which is higher than with sand filters, for example. On the plus side, filter cleaning doesn’t use water.
Each cartridge is lined with a pleated fabric layer, allowing for more effective and efficient filtration. This makes them a good option for eco-friendly pools or areas with limited water . As the pump pushes water into the filter, the cartridge traps particles as small as 10 microns , offering significantly better filtration than typical sand filters (up to 50% more). Cartridge filters are generally recommended for in-ground or above-ground pools, whether made of polyester or removable materials.
DIATOMACEOUS EARTH FILTERS: THE MOST EFFECTIVE FILTRATION
Diatomaceous earth filters are the most effective type of pool filter. They use a layer of diatomaceous earth powder, fossilized microorganisms from algae that extremely effectively filter impurities from pool water. They consist of a series of powder-coated fabric grids inside a plastic tank, allowing them to filter out very small particles as small as 3 microns , including bacteria, viruses, and even traces of cosmetics or oils. This makes diatomaceous earth filters the safest and most effective option for high-traffic public or community pools .
However, they are also the most expensive of the three types of pool filters and require more careful maintenance , needing to be cleaned every few weeks and the diatomaceous earth replaced. Diatomaceous earth filters are an option to consider if budget isn’t a concern and you’re looking for highly reliable filtration, offsetting the expense with improved water quality.
THE MOST ECOLOGICAL SUPPLEMENT: SALT ELECTROLYSIS
Another option to consider besides traditional filtration systems is the innovative saline electrolysis system. As we explained in a recent post , saline electrolysis is a much more natural water purification method that uses salt and electricity to generate chlorine. Although saline electrolysis isn’t a type of filter itself, it can complement or even replace traditional filtration systems. Were you familiar with it?
Do you still have any questions about the best type of filter for public or community swimming pools and which one would be best suited for your project? Contact us and we’ll be happy to advise you!
