Where do I put the backwash in my pool?

Author: scraper  |  Last update: Friday, August 14, 2026

Direct your pool’s backwash water to a designated sewer cleanout, a dry well/French drain, or a grassy area that allows it to safely percolate into the ground. Never drain the heavily chlorinated backwash directly onto sensitive plants, into a neighbor's yard, or into municipal storm drains, as this is often illegal and harmful to the environment.

Where should pool backwash go?

Pool backwash water typically goes to the sanitary sewer system or directly onto landscaped areas (like lawns or rock beds) for natural ground absorption. It must never go into storm drains, as that untreated, chlorinated or saltwater goes directly into local lakes and rivers.

Do you run the pump when you backwash?

Turn off your pool's pump and filtration system. Set the filter value to BACKWASH and ensure the handle locks in place. Turn the pump on and you'll see water flow through the view glass. Wait until the filter view glass is clear.

How long should I leave my pool on backwash?

Backwash your pool filter for 1 to 2 minutes (or until the water runs clear). Always follow this with a 30-second rinse to settle the filter media. Do not over-backwash, as filters actually trap dirt more efficiently when slightly dirty.

Where to put backwash pool water?

Some pool owners divert backwash water onto lawns or gardens. This can work if the water is diluted and chemicals are neutralised. Grasses and some hardy plants may tolerate it, but sensitive vegetation may not. Always check chlorine levels first to avoid damaging your landscape.

How To BACKWASH A POOL FILTER (The Right Way)

How to backwash a pool correctly?

The process is fairly simple, just follow the steps below:

  1. Roll out your backwash hose to someplace that the water can go.
  2. Turn off your pump at the breaker.
  3. Set the multiport valve to backwash.
  4. Turn the pump back on and run until the sight glass is clear.
  5. Turn the pump off at the breaker.
  6. Set the multiport valve to rinse.

Should you rinse every time you backwash?

Backwashing reverses the flow of water, lifts up and flushes the sand, and then expels the dirty water via a waste line into the ground or drain. In order to prevent residual blow back into the pool, once you've finished backwashing it's highly advisable to rinse the filter.

Will shocking a pool get rid of dirt?

Pool shock is a chemical treatment that helps break down contaminants – such as leaves, dirt and debris, even oils from your skin -- that can gradually build up in your pool water. Shocking your pool as part of your weekly pool maintenance routine will help keep your water clear and balanced.

Why is my pool losing 2 inches of water a day?

All pools lose some water daily due to evaporation. Under normal conditions, expect about 1/4 inch per day, with weekly losses typically ranging up to 2 inches at most. However, factors like high temperatures, low humidity, wind, and pool activity can increase evaporation, leading to greater water loss.

How many times do I need to backwash my pool?

You should backwash your pool when its filter pressure rises 8 to 10 PSI (pounds per square inch) above its normal, clean baseline, or about once a week during peak swimming season. Backwashing too frequently wastes water and reduces the filter's efficiency at catching smaller particles.

What will ruin a pool pump?

Pool pumps typically last 8 to 12 years, but premature failure usually stems from overheating, water leaks, or debris blockages. Common culprits include a failing motor (often due to worn bearings), electrical shorts, dry running caused by air leaks, and impeller damage from clogged debris.

Can I use the pool right after backwashing?

I wouldn't get into it without hip waders until the water is clear. I'd skim the surface with a netted leaf removal pole, shock and chlorinate until clear, vacuum the bottom, and then check the chemical levels to ensure they're within acceptable limits. You may also have to add an algecide.

Why does the bottom of my pool get dirty in 2 days after vacuuming?

With time the sand in your filtration system will break down into smaller particles and get out into the pool. These small particles will have no problem going through the filtration system and in the end, get mixed with dirt. This could be a reason your pool gets dirty even after you have vacuumed it.

In what order should I clean my pool?

Clean your pool in this specific top-to-bottom sequence: skim floating debris, brush walls and stairs, vacuum the bottom, empty skimmer baskets, and clean the filter. Always perform physical cleaning before testing and balancing the chemical levels, such as shocking and adjusting the pH.

Why do people put baking soda in their swimming pools?

Baking soda (sodium bicarbonate) acts as a natural buffer that raises both your pool's total alkalinity and its pH. It prevents severe pH fluctuations (known as "pH bounce"), clears cloudy water, prevents equipment corrosion, and helps your chlorine sanitize more effectively.

What is a ghost pool?

The term ghost pool generally refers to one of three things, depending on whether you are talking about billiards, public history, or swimming pool construction.

How many minutes should I backwash?

Backwash your pool filter for 2 to 3 minutes, or until the water runs completely clear through the sight glass. Always follow up with a 30 to 60-second Rinse cycle to resettle the sand and flush out any remaining debris.

What happens if you forget to rinse after backwash?

If you fail to rinse after backwashing, the overall quality of your pool water can decline. Backwashing a filter aims to remove contaminants, but if you fail to rinse the filter after backwashing, you are at risk of putting those same contaminants into your swimming pool.

What happens if you backwash too long?

Backwashing too long alone isnt harmful...running out of water running dry, stuff like that is. Sound like just needs to be fully primed. it will seem to suck air if not primed and air relief is open. Fill the basket with water then close the pump lid, then start the pump.

What comes first, backwash or rinse?

Always backwash first, then rinse.

How much water should I backwash my pool?

For a proper backwash, run it for 2 minutes, then 1 minute on rinse. For my pool, this uses about 7-800L, or about $2 worth of water. I usually run it after rain, as I need to lower the level then anyway.

When you backwash a pool, where does the water come from?

When you backwash a pool, the water comes directly from the pool itself. The pool pump pulls water from the skimmer and main drain, forces it in reverse through the filter to dislodge trapped debris, and expels it out of the waste line.

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