When to backwash the pool cleaner?
How often and when to backwash the sand in the filtration system
The sand in the filtration system captures small impurities from the pool, and occasionally it is necessary to remove these impurities from the sand. The best way to determine when to backwash the sand in the filtration system is by monitoring the pressure on the filter gauge.
When to backwash the filter sand
Let's say the operational pressure (when the filtration is clean) of your filter is 0.5 bar. When the pressure on the gauge increases to 0.7 bar, it's time to backwash.
How frequent backwashing is normal
The frequency depends on how much debris falls into your pool. If there are many trees or dust around, it will be more frequent. In a clean environment, it might be once every two weeks, while in a dusty environment, it could be as often as every other day. Keep track of the backwashing frequency from the first time you start the pool, when the sand is still new and in good condition. After a few seasons, you'll be able to notice if you're backwashing more frequently, which is the right time to consider replacing the sand. You can find out how to do it in our article on sand replacement.
Detail of 6-way sand filtration valve
Special Backwashing of the Filtration System
I recommend backwashing the filter after every pool vacuuming (excluding automatic cleaners).
When using a flocculant and vacuuming fine sediments, it's advisable to backwash the filter multiple times. The particles are very small, and if there are many of them, the sand can quickly become clogged, and the particles may be pushed back into the pool through the nozzles. This will result in cloudy water instead of a clean pool. Spending a few liters of water on backwashing is well worth it.
What happens if you don't backwash the filter sand?
I occasionally hear the opinion of 'I never backwash my filter, and it works fine.' That might be true, but for how long? Sooner or later, the filter will become clogged, and impurities will start leaking back into the pool. Then come the questions about green water, cloudy pool, and chemicals, chemicals, chemicals.
If you don't regularly backwash the sand in the filtration system, having green water might be the least of your worries. What's worse is that you risk damaging the filter tank or seals, and then it'll be all about spending, spending, spending.
