July 5, 2022

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How does a hydrostatic relief valve work in a pool?

6 min read

Asked by: Kendra Scott

Also known as a Hydro-valve it prevents ground-water pressure from raising the pool or causing movement. The hydrostatic valve prevents this by allowing ground-water from your surrounding yard to flow into the pool and relieve the pressure on the pool structure.

How do you release a hydrostatic valve in a pool?


In order to access your hydrostatic valve you will need to remove the main drain lid. In order to reveal the hydrostatic valve that is inside.

What is the purpose of a hydrostatic valve for a swimming pool?

The purpose of the hydrostatic relief valve is to relieve the pool of water pressure for those with high water tables. In this case, the hydrostatic relief valve will open allowing the ground water to enter the pool to relieve built up pressure from underneath the pool.

How do I know if my hydrostatic valve is leaking?

What are some observable symptoms of a leak? ​​​​​​

  1. Your pool loses more than a ¼ inch of water a day.
  2. There are cracks in or around the pool deck.
  3. You need to add water more than once a week.
  4. If you have an autofill, your water bill increases.
  5. Grass around the area is soggy.
  6. Your pool deck is sinking or lifting.

Do I need a hydrostatic valve in my pool?

Without a hydrostatic valve to relieve the pressure, the pool can be moved or uplifted out of the ground damaging the pool structure and plumbing. The movement usually only happens when the pool is empty.

Can a hydrostatic valve leak?

A leaking hydrostatic relief valve may be responsible for your pool’s water loss. This is an easy repair for a qualified diver who will replace the valve without draining the pool. Hydrostatic valve leaking is only a problem for inground concrete, gunite or fiberglass pools.

Where is the hydrostatic relief valve used?

Hydrostatic relief valve means a relief valve installed in the bottom of the swimming pool and designed to operate automatically when the swimming pool is empty, relieving the groundwater pressure around the structure by allowing the groundwater into the swimming pool tank.

How do you stop groundwater seepage in the pool?

How Do I Know If I Have A Groundwater Issue?

  1. Groundwater is virtually everywhere. …
  2. Here are some ways you and your pool builder can prevent and reduce the risk of groundwater issues:
  3. Install a well pit or sump pit. …
  4. Install a perimeter drain. …
  5. Maintain proper water level. …
  6. Reroute downspouts.

What is the plug at the bottom of my pool?

hydrostatic relief plugs

They are called hydrostatic relief plugs or hydrostats, for short. Hydrostat plugs are usually plastered in place, but beneath the plaster, they thread into a piece of slotted pipe that runs through the floor of the pool. Below the floor, this pipe terminates into a gravel pit beneath the pool.

Where does water go when pool leaks?

The pressurized plumbing system pumps water back to the pool after it has passed through the filter. The filtered water returns to the pool through the jet (or return) inlets. The plumbing that returns the water from the filter to the pool is often referred to as return plumbing.

Why is my pool losing water when the pump is off?

Pool Is Losing Water When the Pump Is Off



If you’ve turned off your pump system for a day and the pool level is dropping more than 1/4–1/2” per day, you might have a pool leak. The leak is likely somewhere in the structure of the pool or on the suction side of the pool pumping system.

Why does my pool lose water when it rains?

Pool Losing Water After Heavy Rain



Due to a heavy rainstorm, water loss is more common with vinyl liner pools that can be damaged, come loose, or float to the top. With other types of inground pools, it is vital to get the water level down. If not drained, the water balance will change, causing cloudy water and more.

How do I know if my pool line is leaking?

Several things can indicate a leak, from the water level dropping by more than ¾” in one week to visual signs, including excessive amounts of dirt on the bottom of the pool, new cracks appearing in deck area, water puddles in the area around the pool, and using more chemicals than normal.

Why does my pool lose water overnight?

If your pool lost water overnight and it is more than the quarter-inch due to evaporation, you probably have a leak. Evaporation accounts for a minor amount of water lost each day. Losing a half-inch or more overnight indicates a problem.

How much water loss in a pool is normal?

On average, swimming pools lose about a quarter of an inch of water each day, yet variations in wind intensity, humidity and sunlight can drastically change water loss rates. Some of the strongest and most intense wind in the country can be found in mountainous regions.

How do I find a leak in my inground pool liner?

With the scuba tank and they'll take dye this red dye and they'll squirt it around the areas where they know pools are prone to leaking.

How do I color check my pool for leaks?

Right close to those suspected leak areas I find that the easiest way to administer a small amount of dye is to hold on to the dye tester not like we would a normal syringe with our thumb on top.

How do I find a leak in my pool with food coloring?

So you put your food coloring above. It let it drop down. And it finds your leak. And you suck surrounding it. And the more water you have in your pool.

Why is my inground pool losing water?

Typically, pools lose water for one of two reasons: Evaporation or a leak. Evaporation naturally occurs in any body of water, but it may increase under certain conditions, such as hot, humid weather. Leaks, however, indicate a bigger problem that a professional may need to address.

What is the best way to find a leak in an above ground pool?

Now the main way i was able to find these holes is going around this bottom corner. There's a lot of places where the liner goes from flat to vertical.

How often should you add water to a pool?

This will vary depending upon several factors including: weather, if the pool is covered or not, bather load, and if it is heated or not. With pools that are covered, a good rule of thumb is that they should not have to be refilled more often than once every 2 weeks.

Why does my pool water evaporate so fast?

Evaporation occurs whenever you expose wind or air to the surface of your pool. So in short, this applies to every pool, all the time. Water molecules rise to the surface, form into a vapor and eventually get released into the air. Heated pools on cool nights experience evaporation more rapidly.

How long before pool water goes bad?

Generally, pool water needs to be replaced once every five to seven years. This should be done during mild weather so that your pool surface is not at risk from strong sunlight and heat. Your pool maintenance company can recommend when it is time to drain your pool.

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