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
it means your swimming in a pool with dirty water and fish.....get out!
A Hydrostatic valve is basically a plug that stop water coming down out of the pool, but when the water pressure under the pool gets higher then the pressure in the pool it will let water into the pool from underneath in order to stop the pool from floating in ground water.
Pressure increases with depth in a fluid due to the weight of the fluid column above pressing down. This means the pressure is higher at the bottom of the pool where there is more water above compared to the top where there is less water above.
Let me say first backwashing is a process for simply ridding the filter of dirt, once you backwash the pressure and cleanness of the filter will begin to collect and store more dirt from the pool, Look at the gauge at the filter remember the pressure or write it down as the pressure goes up the flow of water going back to the pool will go down to the point that very little water will go back into the pool. When the pressure is low the water flow from the filter will be high meaning that the filter is not clogged or dirty.
The pressure on a pool filter can decrease due to clogged or dirty filter elements, insufficient water flow, air leaks in the system, or a problem with the pump. Regular maintenance, such as cleaning or replacing the filter elements and ensuring proper water circulation, can help maintain the pressure in the pool filter.
The water pressure is greater at the deep end of a pool because there is more water on top of that which adds to the pressure. If there is more water, the pressure wil be higher because there is more water to put weight on it.
They use some kind of chlorine bleach to disinfect the dirty pool water.
sand down the top if they are burndt or dirty
You have two options when vacuuming a pool. If it a normal weekly vacuume you will set your filter valve to the filter position. This will send the water through the filter and back to the pool. Once your done vacuuming, you then backwash and rinse the filter. A good ratio is 3 min to back wash and 30 seconds to rinse. If your pool is extremely dirty like at the begining of the year, You can sometimes set the filter to the waste position. This will bypass the filter and send the water down the backwash line. This lowers the water in the pool. If your pool is extremely dirty and you try to vacuum with it set to filter, the filter will not catch all the dirt and some will end up back in the pool in the form of dirty or cloudy water. As a pool profesional I always strived for clear water first. You can't clean what you can't see.
Improper maintanence is my guess. The amount of pressure in a pool is great. Just as a water balloon bursts when there is too much pressure so can a pool. Water is heavy. It weighs 8.33 pounds per gallon. Since water seeks its own level it is trying to spread out when confined to a pool. If there is a weak spot in the pool, the pressure will take advantage of it and cause a rupture. Lots of pressure.
No specified pressure at the "return" fittings at pool side. You do not measure pressure at these points.
Pressure inside Earth increases much like pressure in the swimming pool increases.