Pool Filter Pressure Low

Pool Filter Pressure Low: The Causes and Solutions of Low Filter Pressure

Low pressure is a term that is used to denote weak jets and low PSI reading on a pool’s filter pressure gauge. A high PSI can also lead to low filter pressure. 

Therefore, a high or low PSI reading is any number outside the recommended operating pressure of a pool’s filter. Here I address the causes and solutions of low filter pressure.

What Causes Low Pool Pressure Gauge?

When the pressure is not within the recommended range, this often shows a flow problem, and something might be restricting or blocking the water flow into your pool pump. It can be a problem after the pump, since after the impeller, the water is under immense pressure, and blockages lead to high pressure.  

Here are some of the issues that can lead to low filter pressure:

  • Restricted water movement in your pool
  • Clogged pump impeller
  • Blocked skimmer basket or pump basket 
  • Pump priming partially or the presence of air in the system when it is off
  • Pool cleaner not circulating the pool 
  • Eyeball fittings out of place at pool inlets 
  • Filter valve letting the water to bypass the filter
  • Bad pressure gauge 
  • Chemical treatments balanced, but the water is still cloudy or turning green
  • A clogged main drain cover or skimmer pipes 
  • Partially closed or closed main drain valves or skimmer
  • Air getting into the system at pump lid, valves, or pump intake 

How to Fix Low Filter Pressure Issues 

Below are some of the solutions that you can try to fix some of the issues that lead to low filter pressure.

Strainer and Skimmer Baskets 

If the basket, strainer or skimmer, is full of trash, you can be confident that it will shut off the pipe between the pump and the skimmer. That reduces the flow of the water into the pump.

When there is less water getting into the pump, it moves less water out. What that means is that the pool pump does less work, causing the water pressure to drop.  

Ensure that you clean the dirt to leave the baskets empty.

Clogged Filter

If the water cannot get via a blocked filter, you can expect less water to flow out of the filter. That will increase the pressure in the filter, showing that it is time to clean it.

Clean the filter as follows:

  • Soak it in a TSP solution for about 12 hours to get gunk and grease out 
  • Soak the filter in muriatic acid solution (10:1) to remove the minerals
  • Backwash a sand filter 

Clogged Impeller

It is one of the most ignored problems. Water can easily rotate out the sides of these devices if it gets blocked. That reduces suction, leading to low water flow via the pump.

Ensure that you clean the impeller.

Suction Leak

A leak in the suction side of a pool pump can result in several problems. If it is large, excessive air gets sucked into the system and the pump loses prime. 

A small leak allows air to get into the pump and accumulate at the top of the pool’s filter tank.  After sometimes, the air pressure accumulated creates back pressure that reduces the water flow. 

Fix the leak to prevent low filter pressure.

Bad Pressure Gauge 

Your pool’s pressure gauge might be faulty. The low filter pressure reading might be because of this issue, meaning that you should replace the pressure gauge.

Correct Filter Pressure Gauge Reading

Most filters are made to operate in the 5 PSI to 15 PSI or 10 PSI to 20 PSI range. It is time to clean your system if the pressure rises or goes below these ranges.

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