Empty your swimming pool: why? When? How? ‘Or’ What ?


You own a swimming pool and this time the situation is dire. Your pond is full of algae, dirt, oddly colored, and floating in it full of debris. You only see one solution: empty the pool, start from scratch. However, draining your swimming pool should be the solution of last resort. Of course, at the very start, when building your pool, you have to fill it. But the question of cleaning shouldn’t make you empty it. A pool drain is done every 5 to 7 years on average and especially in the event of major repairs. Otherwise, avoid emptying your pool as much as possible. Basically, if you want to know when to empty your pool, the answer is: when you have no other alternative.

Why not drain your pool?

Draining a swimming pool is a risky business for several reasons. Your pool is not meant to be empty. Whether you have a pool with a liner, concrete or fiberglass, it will perform best when it is full of water. Once the water is emptied you expose yourself to all kinds of damage, so only drain your pool when you have no other option.

The greatest danger you run when draining your pool is that of hydrostatic pressure. It is a term that seems complicated relating to the pressure of the groundwater around and under your swimming pool, this one being carried out against the walls and the ground of your swimming pool. The water is heavy and the hydrostatic pressure can be high. If you and the professional who built your swimming pool did not sufficiently anticipate the problem of hydrostatic pressure, you may face unpleasant surprises.

What are the risks when emptying your swimming pool?

The pitfall of hydrostatic pressure

Here is a very telling example: if you have a concrete swimming pool, the pressure of the water below can cause its ground to move and crack it. In a pool with a liner or fiberglass, the hydrostatic pressure below can go as far as lifting the bottom of your pool, severely damaging the ground and the walls. Your swimming pool that lifts off the ground is a serious problem that can arise if the groundwater level in your area is high. This may be the case all the time, or only after several days of heavy rain. The problem occurs when your empty swimming pool begins to float on groundwater.

UV damage

Empty swimming pools are also susceptible to damage from sunlight. Vinyl swimming pools tend to wrinkle when emptied. Fiberglass pools can crack.

Damage to your filtration pump

If you do not properly adjust your filter, pool hoses, and drains, you run the risk of damaging or burning your pool motor.

Flood risks

Be careful not to empty your pool water anywhere. Putting too much water in your water drainage system can cause it to backflow into your home.

When and why should a swimming pool be emptied?

As said above, most swimming pools rarely need to be drained. Because draining a swimming pool without damaging it can be difficult, there are often solutions to do the most necessary work without removing all the water. However, there are several reasons why you may have to empty your pool: too much dirt – mixing chemicals and the like, the need to repaint your pool or other repair work.

What is the best time of year to drain a swimming pool?

Depending on the type of material your pool is made of, exposure to the elements can damage it. For this reason, the best time to empty your pool is when the weather is mild. If it is too hot or conversely too cold, it is preferable in this case to postpone the emptying. Because of these temperature settings, the best time of year to drain a pool is usually spring or fall. Spring can be a good option, as the renewed water will then be ready for summer swimming. Fall can also work, but most pros don’t recommend leaving your pool empty during the winter, so you’ll need to at least partially fill it.

How to empty your swimming pool?

Before emptying your pool, groundwater levels should be taken into account. If the water levels in the area are high, they can cause your empty pool to “pop” out of the ground. Additionally, fiberglass and vinyl pools require special treatment as they are generally not designed to be fully emptied. The complete removal of water from these pools can cause cracking in places. Once you have assessed the groundwater situation and the needs of the type of pool you have, the safest way to drain your pool is to use a pump. You can buy one or rent one from a swimming pool equipment company. Although your filtration pump can be used to drain your pool, it can still damage it. The water in your swimming pool must be drained into your property. Of course, this one is not used to receiving huge amounts of water at once, so make sure that the flow is low enough. Draining a swimming pool completely with a garden hose can take a day or more.

When to consult a professional?

If you are not 100% sure that your pool needs to be drained, you should consult a professional. Many pool repairs can be done underwater. If you don’t know much about groundwater in your area, or if you’re not quite sure how to empty your pool, talk to a pool professional who may be able to help you. help.