Bit of an odd one this but here's all info I can give.
In normal filtering mode the pressure gauge reads 1.2 and is between the green and yellow zone. I've changed the angles of the return jets so that the water breaks the surface (as I want to raise the PH) and I can see a decent flow of water. I connect the vacuum hose, open the side wall inlet valve and close the bottom drain and skimmers, the pressure gauge drops to 0.8 which is normal. I start vacuuming and after 10 minutes I can see that the water from the return jets has slowed to a trickle so I check the pressure gauge and it is now in the red at 1.6. I naturally assumed I just needed to do a backwash and did this once a week for a few weeks before it dawned on me that I normally backwash once every 2 to 3 months. I then decided to turn off the pump when the gauge hit 1.6, leave it for 10 seconds and turn it back on again and sure enough, the gauge went back to 1.0 but very quickly went to 1.2 and after 5 minutes was back at 1.6.
I pull the vacuum pipe off the side wall connector, let the pump run and it runs fine at 1.2 for 10 minutes. This would suggest there's a blockage in the pipe of the vacuum cleaner but water and air pass though it unhindered. The pool is perfectly clean, all readings are in range and I scoop out the leaves and pine needles before vacuuming so that they don't block the pipes. I would seem just the act of using the vacuum cleaner causes the filter gauge to rise from 1.2 to 1.6 in 10 minutes despite no obvious blockages or any nasties in the water . Any ideas what could be causing this?
EDIT. I should add that when I put the vacuum in the pool, I feed the pipe straight down into the pool causing the air to be pushed out. When I have fed all the pipe under the water and I am holding the connector, water comes out as I lower it to the side wall connector so I know there's no air in the vacuum pipe.
In normal filtering mode the pressure gauge reads 1.2 and is between the green and yellow zone. I've changed the angles of the return jets so that the water breaks the surface (as I want to raise the PH) and I can see a decent flow of water. I connect the vacuum hose, open the side wall inlet valve and close the bottom drain and skimmers, the pressure gauge drops to 0.8 which is normal. I start vacuuming and after 10 minutes I can see that the water from the return jets has slowed to a trickle so I check the pressure gauge and it is now in the red at 1.6. I naturally assumed I just needed to do a backwash and did this once a week for a few weeks before it dawned on me that I normally backwash once every 2 to 3 months. I then decided to turn off the pump when the gauge hit 1.6, leave it for 10 seconds and turn it back on again and sure enough, the gauge went back to 1.0 but very quickly went to 1.2 and after 5 minutes was back at 1.6.
I pull the vacuum pipe off the side wall connector, let the pump run and it runs fine at 1.2 for 10 minutes. This would suggest there's a blockage in the pipe of the vacuum cleaner but water and air pass though it unhindered. The pool is perfectly clean, all readings are in range and I scoop out the leaves and pine needles before vacuuming so that they don't block the pipes. I would seem just the act of using the vacuum cleaner causes the filter gauge to rise from 1.2 to 1.6 in 10 minutes despite no obvious blockages or any nasties in the water . Any ideas what could be causing this?
EDIT. I should add that when I put the vacuum in the pool, I feed the pipe straight down into the pool causing the air to be pushed out. When I have fed all the pipe under the water and I am holding the connector, water comes out as I lower it to the side wall connector so I know there's no air in the vacuum pipe.
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