Cleaning the filter will lower the back presure. or else a hole in a cartridge filter will also do it.
Under 5 m of water the pressure will be greater than under 2 m of water. The shape of the body of water is irrelevant.
more water is on top of it putting more weight on the water at the bottom
water pressure
same as the bottom
at the ocean and going deeper into it
It could be as low as 8, or 10, 12, the pressure could even be lower depending on your filter size, the lower the pressure the cleaner your filter media is the higher the pressure say 17, then you need to back wash or change the media, if you are not using sand.
when the pressure is high on filter mode it usually means that a backwash is required.
The lower the pressure the less work the filter is doing, 7 to 10 psi is a good pressure. Another tip would be to put your hand by the outlet where the water goes back into the pool if the water pushes your hand away you have good pressure also take a pressure reading at the filter, if you put your hand at the outlet and the water does not push your hand away take a pressure reading, backwash the filter, put your hand at the outlet again if it pushes it away go back to the filter look at the gauge and see what it reads now, and that would be your suggested low pressure for your filter.
Usually the pressure gauge on your pool equipment indicates how much pressure there is before the filter. as the pressure goes up it indicates that the filter is getting blocked and needs a backwash or cleaning. while the pressure is low the filter does not need cleaning.
The cleaning schedules varies from filter to filter, but a general guideline on any swimming pool filter is to take a reading when the filter is clean, then clean the pool filter when the pressure rises about 10 psi.
because the leak releases pressure?
Clean the Filter!
I suppose. Was that the pressure when the filter was new of very clean? No 2 filters will be exactly the same.
You can not measure the pressure in a swimming pool. If you mean the pressure on the filter tank gage then you may have to backwash the filter. Talk to your local pool store for instructions as how to maintain a swimming pool and the equipment. Get some education on swimming pool maint. before you get into some real trouble. A pool is not too forgiving for someone without a basic knowledge of pools.
As the filter gets clogged it restricts the flow of water and the pressure in the return line drops. The pressure gauge on the filter itself indicates the entry pressure and that will go higher as the filter becomes clogged. Don't ever allow the pressure to reach 40 PSI. Back-washing the filter should restore the pressures. Pool Masters
If you remove the cartridge from your filter housing, the presssure reading will drop. If you are having low pressure issues this is an easy way to determine if the problem is on the pressure side of the suction side of the pump. Depending on what type of pool you have, and what in on the equipment pad. If you pump usually runs at 15 -18 psi then with out the filter I would guess it would be about 8 psi. Hope that helps.
It is not possible to have a pressure level on your swimming pool! However the pressure on the filter gage could run anywhere from 5# to 35#