Backwashing is the term because that reversing the flow of water in and also out that the filter tank, to clean a sand or DE swimming pool filter.

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Sand filters and Diatomaceous earth (DE) Filters are backwashed to remove trapped debris, to raise flow rate and reduce system pressure. Cartridge filters room not backwashed, but instead the cartridges space removed and also hosed clean.

Backwashing a sand or DE filter is a straightforward task. Shut off the pump, set the multiport valve or slide valve take care of to the backwash position, role out the backwash hose and turn the pump ~ above again. Backwash for 3-4 minutes or until the water operation clear, climate shut the pump off and also return the valve come the filter position. Simple enough, and likely not brand-new information.

What i hope is new information however, space some best practices for as soon as to backwash, and also how to boost backwashing or obtain the best possible cleaning because that your swimming pool filter.


The pressure gauge is the indicator that lets you know when it’s time to backwash. As the dirt fill builds up inside the tank, the flow rate decreases and also the tank press increases. As soon as the filter press gauge reads 7-9 psi greater than the clean, start-up pressure, the is time come backwash the filter. However, if your flow rate or skimmer suction is significantly reduced in ~ 5 psi, don’t wait until it reaches 7 psi come backwash.


Backwashing a sand filter too often can develop worse filtration, because a sand filter performs far better when that is slightly dirty. Dirt trapped in between sand grains help to trap much more dirt, and when fifty percent dirty, a sand filter can be twice as effective, as when fully clean. Backwash only when the pressure gauge is at the very least 5 psi greater than the clean pressure, or once water flow is noticeably reduced.

DE filters deserve to be ‘Regenerated’ by act a fast 5-7 2nd backwash, well-known as a “Bump”. As the water is (briefly) reversed inside the filter tank, that mixes increase the dirt and DE powder, and when put back into filter mode, the mix re-coats the grids, permitting for greater flow and lower pressure. In this way, you can expand the size of time in between full backwashes – conserving time, water and DE powder.

HOW long TO BACKWASH A swimming pool FILTER

Just as lengthy as you require to, till the water is to run clear at the finish of the hose, or in the sight glass, which part valves have for city hall the garbage water clarity.

The bigger the filter is, the much longer it must be backwashed. Small to medium sized filters room usually clean in 2-3 minutes, and also larger filters might take 3-5 minute to backwash fully.


DE filters can be backwashed 2 or 3 times in succession, come remove much more debris than is possible from simply once. ~ backwashing a DE filter because that 2-3 minutes, return the valve in the Filter position, and run the pump for 15 seconds. Then set the valve come Backwash again, for one more 30 seconds. Repeat lock cycle a third time, because that the most effective backwash of a DE filter.

Sand filter beds have the right to be deep cleaned by removed the top valve or dome, and also closing turn off suction and also return valves. Probe the sand bed v a garden hose (water running), to do the washing up deep inside the sand, and overflow the tank v water and trapped debris. Friend can also rake the sand bed through your finger or a hand hoe, to remove mud-balls or calcified clumps of sand. ~ reassembly, begin up the filter on backwash, complied with by 20 seconds on the wash setting.

Sand Filters can additionally be really easily cleaned using Sand Filter Cleaner, i m sorry is added to the tank ~ above the backwash position, then the pump is easily shut off, allowing the chemistry to soak the sand overnight. The following morning, a full backwash will expose the dirt, oils and gunk that constant backwashing leaves behind, which can just surprised you.

DE filters can also benefit extremely from an annual soaking in a DE Filter Cleaner, to remove pore-clogging oils and mineral scale. ~ cleaning completely as above, soak the entire grid assembly in a big (clean) trash deserve to filled v water and DE Filter Cleaner. Soak for number of hours, climate flip the assembly upside down and also soak again (unless you have the right to submerge the grids entirely at once). Scale can additionally be eliminated from DE grids by soaking or spraying with a gentle (10:1) acid solution, or because that greasy films, usage 1 lb. TSP per 5 gallons (hot) water.

DE filters need a finish cleaning every 6 months, to maintain peak performance. ~ backwashing thoroughly, open the air bleeder and remove the clamp band, and also then the filter lid. Lift out the whole grid assembly, or if too heavy at first, remove the drain plug and water tap the grids clean while inside the tank. After ~ removing the grids, location in a secure area, where it won’t autumn over, which could crack the manifold. Spend 10 minutes cleaning between the grids, then hose the end the tank, and also the tank o-ring, prior to replacing the grid assembly and clamping the tank tightly.

Separation tanks, sometimes used ~ above DE filter solution to different the DE powder from the waste water, often results in poor backwashing due to the added restriction that the separation tank, to reduce backwash flow rates. Friend may be able to cut a separation tank the end of the system, but not if your waste water flows into a present or other delicate ecosystem, or where compelled by regional ordinance. Once using a separation tank through a DE filter, increase the frequency of hands-on cleaning, from twice per year come 3 or 4 times every year.

How often do you should backwash? If you uncover that you have to backwash the filter much an ext often 보다 in the past, this means that the filter media needs replacement, or is in need of a significant cleaning. The usual reason is oil or minerals, or both clogging up the filter sand or DE net fabric.

Filter media is either Filter Sand (or filter sand alternative), DE grids, or filter cartridges. Together filter media ages, that becomes less able to catch debris together effectively, inquiry longer daily filter runs and also chemical enhancements as compensation.

Generally speaking however, because that the mean inground pool, filter sand or sand alternatives can last about 5 years, DE grids remain undamaged for 10 years, and filter cartridges are great for 3 years. Aboveground pools however, with tiny filters typically need new sand or cartridges every 1-2 seasons.


Not necessarily, however it relies where friend pump your discharge water. Swimming pool water through normal level of chlorine or algaecide pose tiny danger, however high levels can harm little insects, plants and also water creatures. DE powder can throttle a tiny stream or death grass if you space not careful. And sending a thousand gallons downhill towards a neighbor have the right to cause another kind that problem, specific erosion and/or flooding. Relocate the backwash hose commonly to avoid over-saturation, or run straight to the storm drain, if enabled by regional ordinance.


Backwash hoses are optional, however not utilizing one deserve to be messy, and also could erode the soils about the tools pad, causing it to slip and also slide. Backwash hose is obtainable in 1.5″ or 2″ vinyl water tap of various lengths.

Use the 1.5″ water tap for tiny pumps, and also 2″ hose for bigger pumps with greater water volume. The water tap attaches come a rubbish port hose adapter, organized on through a hose clamp. A smaller length of water tap is much easier to manage, yet if longer hose is essential to with your best discharge destination, they have the right to be join (or repaired) with insert connectors and clamps.

Before turning on the pump to backwash, make sure that the water tap is no twisted. Keep your eye on the hose, and if it kinks, closeup of the door the pump off quickly, prior to the water tap splits.

When excellent backwashing, drainpipe the hose by elevating it with your hand in ~ the filter, and also walking to the other finish of the hose, where you can begin to roll up the hose. If you don’t role up the discharge hose each time you use it, the won’t last almost as long.

After rolling increase the water tap tightly, place the hose in a clean and also dry area, in between the valve and also filter tank, or up against the base of the filter tank, or top top the concrete, beneath an upside under bucket. This will aid protect the from the elements and keep that from becoming slimy and grimy.

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For pools with restricted space or places to send backwash water, you have the right to re-purpose your filter rubbish water to water her lawn or garden, or just prevent erosion. The Eco swimming pool Backwash Fountain turns your backwash garbage water into a lawn sprinkler, to protect against erosion and also flooding once backwashing your filter.