The most important thing to ensure when selecting a new filter or pump is that they are both appropriately sized to each other. A larger filter requires less cleaning but can use more water to clean. It also requires a bigger pump. A smaller filter will clog up to often and not handle heavy loads or require long running times. You must also have an appropriately sized skimmer box and return jets to handle the water flow. For more information contact us, or visit our showroom, and we can help determine the best equipment for your pool.
What is the difference between pumps?
Most manufacturers produce a standard and heavy duty range of pumps. The key differences to consider when selecting a pump are noise, energy efficiency, water flow and water pressure. Modern all-in-one plastic cased pumps provide the highest energy efficiency using water to continuously cool the motor and with the highest output for the lowest power input. Older pump and motor style pool pumps have the lowest energy efficiency. As pumps are often in wet areas those with stainless steel rotors (not mild steel) will not rust and as a result will last longer. These usually come with a 3 year warranty. Lastly you must consider water flow. For solar systems, pressure cleaners and fountains high pressure pumps with lower water flow volumes are preferred however for you standard primary pool pump you want lower pressure and higher water flow. The main thing to consider here is that the pump is the appropriate size for your filter. Choosing a larger pump does not mean better filtering, in fact this just pushes the water through the filter too fast and reduces filtering quality.
What is the difference between filters?
Sand filters operate by filtering the water through a large bed of sand (that is why they are bigger). As the water is pushed through the sand by your pump the dirt is trapped in the sand. When you backwash the filter the water actually flows backwards through the tank and washes the dirt back out of the filter, but into the drain rather than your pool. The rinse cycle settles the sand down again and washes out any loose sediment. Opinions vary regarding how often sand should be changed, but how often do you change sand on a beach? Sand is a form of glass and as such cannot rot or decompose. Unless problems arise you will probably change your sand filter before you should need to change the sand (e.g. 15 years). It is important to remember with older filters that disassembling them to change the sand can cause more problems as parts can be easily broken and spare parts may not be available. Sand filters are not as efficient as other filters which is why we run them longer hours, but they are much lower maintenance.
Cartridge filters operate by catching dirt on the outside of a cartridge element which can be easily hosed clean. There are no valves or difficult plumbing. They are much finer than a sand filter but this means they can also clog faster. The advantage is that they can be cleaned easily and their finer filtering quality means they can operate for less time. If you have a lot of sediment in your pool or the pool gets green algae, clean your cartridge filter immediately, because it will clog with these fine particles. These filters can remove anything down to 10 microns which is much smaller than we can see.
WATER RESTRICTIONS – Cartridge filters use less water!!
Although they do require hosing to clean, a cartridge filter cleaned with a pressure hose will require only up to 15 litres of water to clean. A standard pool pump will pump up to 350 l/min. This means that a 2-4 minute backwash on a sand filter will require between 400 and 1400 litres.