How often should a sand filter be backwashed?

How Often Should I Backwash? A good rule of thumb is to backwash once the pressure displayed on your pressure gauge is 8-10 psi over the starting level. Backwashing after heavy rains, treating for algae, or when trying to clear cloudy water will keep your filter working efficiently.

Also, Do you lose sand when backwashing?

You shouldn’t normally lose sand during backwashing. You should not have to add sand, ever. Only backwash when the filter pressure goes up 25%. There’s no reason to backwash any more than this.

Hereof, Can you backwash a sand filter too much?

Can You Backwash Too Much? If you backwash your pool too much i.e. time duration and/or close frequency then yes you can cause a lot of problems. Some problems that can arise from backwashing your sand pool filter too much are: Loss of water – 500+ litres of water can be lost in each backwashing cycle.

Also to know Why does my sand filter keep putting sand in pool? Your pump may be too large or the sand level too high in the filter. When the filter is backwashing the water flow can cause the sand to rise high enough and overflow into the standpipe, which will allow the sand back into the pool.

Do you vacuum a pool on backwash or waste?

8. Vacuuming pool with filter valve in “backwash” position. When a pool is vacuumed with the sand filter valve in the “filter” position, the dirt and debris that passes through the pump ends up inside the filter on top of the bed of sand which is where you want it.

23 Related Questions Answers Found

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What is the difference between pool sand and regular sand?

Pool sand is a very effective filter, but it’s also a bit pricey. … Play sand and pool sand are not the same, however, and are not interchangeable. Pool sand is much finer and smaller than play sand, and the two types of sand are composed of different materials.

What happens if you backwash your pool too much?

Backwashing can result in a loss of water. While this is unavoidable, you can minimize the amount of water you lose by not overdoing the backwashing process. Keep a close eye on the color of the water through the view glass and stop the minute it becomes clear.

How do I know if my sand filter is bad?

If you’ve noticed that the backwashing cycles have become shorter, then you should check to see if the sand filter is dirty or greasy. If the filter is dirty or greasy, then don’t be surprised if it takes on the appearance of sandy lard. When this happens, the water doesn’t flow through the sand filter media.

What PSI should my sand filter be at?

Generally speaking, a pressure reading between 10 – 25 psi can be considered normal. Once you have installed a new filter, turn everything on and take a baseline reading. Each time that you change your pool filter take a new baseline reading.

What happens if you don’t backwash your pool?

Backwashing can result in a loss of water. While this is unavoidable, you can minimize the amount of water you lose by not overdoing the backwashing process. Keep a close eye on the color of the water through the view glass and stop the minute it becomes clear.

Can I vacuum my pool on waste?

Vacuuming to WASTE can only be accomplished if a multiport valve controls your pool filter system. This position bypasses the filter and sends all the unwanted debris through the waste line. Note: Vacuuming to WASTE drains the pool, so keep an eye on your water levels.

What setting do you vacuum pool on?


To begin vacuuming your pool:

  1. If you have a sand filter and are vacuuming to waste, set filter to “waste” option. …
  2. Otherwise, leave setting on “filter” and turn pump on to begin vacuuming. …
  3. Vacuum your pool just as you would vacuum your living room, picking up debris or algae as you go.

Is there a difference between play sand and regular sand?

Over the years we have been asked the question “What is the difference between play sand and builders sand?” The simple answer to this is that play sand is a less coarse, much finer version of builders sand that has been through certain processes to make sure it is safe for children to play with.

Does sand damage pool pump?

Answer: Get as much of the debris and algae as you can out manualy (net, vacuum). You can also vacuum the sand, but make sure you vacuum to waste so it does not damage your pump/filter again.

What kind of sand should I use for my pool filter?

Silica pool filter sand is the most commonly used type. It’s inexpensive, easy to find, and can filter particles down to 20 microns, which is approximately 0.0008 inches. Silica sand is made with ground quartz, and it has rough edges to help trap particulates.

How full of sand should a pool filter be?

How Much Sand to Add to Pool Filters? Sand filters are not filled completely full of sand, but only about 2/3 full, to allow “Freeboard” space in the tank, above the sand bed.

Does backwashing remove water from pool?

The backwashing process reverses the flow of water to flush out contaminants from a swimming pool filter. It should be carried out until water runs clear through the waste line.

How long do you rinse after backwashing a pool?

Turn the lever to RINSE, start the pump and rinse for about 15-30 seconds. Stop the pump and turn the lever to FILTER. This is the normal operating position.

What time of day is best to shock a pool?

The ideal time to shock your pool is in the evening after all swimming is complete. In the evening because the sun will not be boiling the chlorine out of your pool, and after everyone is done swimming because shocking is going to bring the chlorine level up to a level that may be irritating to skin and eyes.

How often should you change pool filter sand?

On average, sand should be replaced every 3-5 years. This may be longer if the pool has less use, is well managed, chemically balanced, & is clear.

How much does it cost to replace sand in pool filter?

Replacing a pool sand filter can be as cheap as $290, but can also cost as much as $1,000 or more, on average, depending on how big your pool is and what type of sand filter you choose.

Is 30 psi too high for pool pump?

Generally, if your pool filter water pressure rises more than 10 PSI over the normal range, it’s time to clean – or possibly even replace — your filter. For most filters, 20 or 30 PSI is considered too high, but you should consult your pool professional to make sure that’s true for your model.

Can a pool pump be too strong?

There is a very persistent myth in the pool world that the higher the horsepower, the better. As a result, it is probably safe to say that the majority of pools have oversized pumps. … Too large of a pump can cause poor filter performance and even damage it, if the filter is not also oversized accordingly.

Do sand filters go bad?

You can reuse the filter sand if it’s still in good shape. Generally, pool filter sand lasts about 5-7 years before it wears out and needs to be replaced (except for very small filters used on aboveground pools, which usually need new sand much sooner.