What might cause the pressure on a 1 year old Hayward sand filter that has just been cleaned with a Sun filter cleaner and backwashed to remain high?
i'm not familiar with brand but no matter. what effects the influent preasure of a sand filter are preasure coming in pruduced by pump.if a valve was normally choked (not fully openned ) before to control the the flow this could be your problem. check the rating that your sand filter can handle and volume spec required by your pool/ spa. more likely especialy if a hot tub, is that due to heavy use or infrequent cleaning, your filter is still clogged. oils and greases will 'ball' and clogg filters. cleaners will not always break these down and you sand may need to be replaced. check your sand first to see if it is dirty or greasy. influent and effluent gage would help monitor your cleaning requirements. influent preasures go up and effluent preasures go down as filters get dirty. Check the gauge. We thought something was wrong with our filter and/or pump and it was just the gauge. Check to see that the pressure goes to zero when the pump is off. It sounds elementary, but can easily be overlooked.
The cleaner the filter is the lower the initial back pressure is going to be, if you have a valve between the filter and the pool return turn, shut of the flow of water for just a moment. if the impeller is working properly the back pressure gauge should suddenly start to read high. Other reasons for low back pressure may be that the seals inside the unit are not properly settled.
Prior to the vacuum cleaner, carpets were cleaned by sweeping them with a stiff bristle broom. The benefits of the vacuum cleaner are that it cleans more thoroughly and completely than sweeping did, and it also does not fill the air with dust which sweeping did (assuming it is in good working order).
2001 Jeep Grand Cherokee after your engine warms up the oil pressure will drop when idle the engine does not make a knocking noise what would cause this?
No. First of all it wouldn't stay on the ground. and why would you need to vacuum? A vacuum cleaner depends on a difference in air pressure to operate. With no air pressure in space, there could be no difference in air pressure and thus no operation. Inside a manned spacecraft, which is usually pressurized a vacuum cleaner will obviously work just fine; especially for collecting and disposing of water globules. Also the standard NASA…