As a general rule, you should be backwashing your pool about once a week or in conjugation with your scheduled maintenance. Another industry standard is to backwash when your filter’s pressure gauge reads 8-10 PSI (pounds per square inch) over the starting level or “clean” pressure.

Also, Does algae look like sand?

Mustard algae is a chlorine-resistant form of green algae that often resembles dirt or sand on bottom or sides of pool.

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 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.

How often should I backwash a sand filter?

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.

20 Related Questions Answers Found

Does dead algae look like sand?

After all, you are in the middle of a slam and dead algae looks like sand. If you want to verify if sand is coming from your returns, use a rubber band and a nylon sock or some other material and rubber band the nylon sock to one of your returns. If sand is spitting back in the pool, the nylon will catch it.

What is the brown stuff at the bottom of my pool?

The appearance of brown algae on the bottom of the pool is a sign of the beginning of an infestation of mustard algae. This is one of the most difficult types of algae to get rid of, and gets its name from its yellowish-brown color.

Can you swim if pool has mustard algae?

But mustard algae is a horse (or at least a plant) of a different color. … These algae are chlorine resistant, and more persistent than an Amway salesman in a stuck elevator. Mustard algae likes to attach itself to pool walls and other items, which is a problem since it can also survive outside your swimming pool.

How often should you change sand in sand filter?

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. Shorter if the pool gets a lot of use, not properly maintained, the H2O is not chemically balanced making the Sand filter work longer & harder.

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 filter?

Backwashing A Pool

It reverses the flow in the filter and sends water out through the multiport valve waste line. Not backwashing your pool will result in a continuous rise of sand in the water, and flow will continue to go down. With this, some filter pumps could explode and result from closing call injuries.

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.

Can I vacuum my pool on filter?

If you have a sand filter and are vacuuming to waste, set filter to “waste” option. … This option allows you to vacuum the algae up and send it out through the backwash line, avoiding getting algae into your filter sand. However, you will need to vacuum quickly, as water will be exiting your pool quickly.

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.

Can a sand filter remove algae?


The dead algae is likely too fine to be vacuumed through your sand filter, therefore owners of sand filters must vacuum on the waste setting. Cartridge filter owners can vacuum up the dead algae but need to clean the filters thoroughly after doing so.

How long should you rinse a sand filter?

Rinse the filter for about 1 to 2 minutes or until the water in the sight glass is clear. NOTE: Any electric heater must be off. Stop the pump. Turn the lever to RINSE, start the pump and rinse for about 15-30 seconds.

Do you have to add De Every time you backwash?

If you are replacing DE Powder after a backwash, you will not need to add the full amount – generally around 80%. The grids will have retained some of the DE Power after the backwash, and if you add too much, it may end up in the pool. The best way to assess how much DE Power to add is to monitor the pressure gauge.

Is pool sand coarse or fine?

Pool sand is much finer and smaller than play sand, and the two types of sand are composed of different materials.

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

Replacement sand for your sand filter typically costs around $25 per 50-pound bag, and your filter may require 100 to 600 pounds or more depending on the size and model. More than likely, you’ll need about 350 pounds of sand for an average-sized inground pool filter.

What happens if you swim in a pool with algae?

Whether mild or severe, it isn’t recommended. Significant amounts of swimming pool algae welcome a breeding ground of harmful bacteria that feed on algae. These bacteria pose health risks to swimmers, most commonly resulting in a skin rash. It can also cause various bacterial infections of the ears or eyes.

Is it safe to swim in a pool with brown algae?

Algae can be very slippery, causing swimmers to fall resulting in bumps, bruises, cuts and even broken bones. Don’t try to swim in a pool that’s full of algae. Besides causing injuries, an algae infested pool creates a higher risk of drowning for those who are not expert swimmers or those who fall unconscious.

How do you know if your 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.

How do I get the dust out of the bottom of my pool?

Brush the walls every week during swimming season while the pump is turned off. A vacuum removes the debris that collects on the bottom. Vacuuming requires moving the vacuum head over the debris on the bottom of the pool until the bottom appears clean.

Does mustard algae feel like sand?

Mustard algae is a form of green algae that is highly resistant to chlorine. … Mustard algae is yellowish-green in color and often looks like dirt or sand on the bottom or sides of the pool.

Why is the bottom of my pool turning yellow?

In pool water, chlorine ions immediately mix with water molecules to form colorless hypochlorous acid. Shades of yellow can be a sign of excessive iron. … Iron can be introduced into a pool by well water or pipe corrosion somewhere in the pool system.

Why is the bottom of my pool yellow?

Mustard algae, yellowish-green or brown in color, often attaches to pool walls and other items including pool equipment, toys and even bathing suits. … Since it is chlorine resistant, mustard algae can be hard to get rid of once it’s in your pool.