Too much suction !!

[cwstnsko]

That seem counter-intuitive. It'd be like saying that your vacuum cleaner has more suction with a dirty bag than with a clean one. To have more suction, you need higher flow rate. Dirty filters cause a lower flow rate and should result in less suction

[mas985]

There is only one condition where this can be true and that is with a 2 speed pump. Going from low to high speed, you are effectively changing the HP of the pump so you will see both a rise in PSI as well as suction.

Assuming the same pump and speed, and the PSI rise is due to a dirty filter, solar or other return restriction, higher filter pressure = more head loss which means less GPM. Less GPM = less suction. This what hydraulic theory dictates and what I have confirmed through measurements.

If you had a suction guage on your pump, you would see it drop with higher filter PSI. However, just the opposite happens when the PSI drops so perhaps this is what you are experiencing.

[karenkr]

Ok guys ---thanks for all the input but honestely we do have too much suction. Hubby actually bent the pole trying to get the head unstuck. Also you are talking to a real dummy here. As you can guess this is our first season of maintaing our pool on our own so we have lots to learn and we sure do appreciate your help.The pump is an AquaTool Sand filter,Stay -rite
dyna Glass with RPM of 3450- tank says 300lbs. I have no idea about what I just wrote--that is just what it says on the tank. Thought maybe it might help you guys.
To vacuum we put this black disc in the skimmer and attach the hose filling it with water. The head is attached at the end of the hose that we put in the pool. Keep water pressure about 15--if it starts to rise we backwash. The only thing we have not been doing is rinsing MAYBE that is the problem!! Could the sand be too dirty? Water is dirty when backwash but clears right up in few min. Should I be rinsing after I backwash??
Duraleigh you suggested restricting the ball valves on the pressure side of the pump---How do you do this (told you I was a dummy)

Please keep the suggestions going--ALL help is appreciated

Thanks
Karen

[duraleigh]

Karen,

You should have a valve/valves on the pipes that come out of your filter and take the water back to the pool. If you partially close that/those valves, your pressure will rise on your guage and you will have less flow throughout the entire system....that means less suction.

I'd stop closing the valve when the pressure got to 25...maybe 28 max.

[NeilK]

With some of the pool owner's manuals I've read, if the vac head gets stuck on the bottom, it is recommended to shut off the pump. That should take care of any pole bending problems when trying to free the vac head.

A few questions.
Does your pool have a main drain?
Does your pool have 1 or 2 skimmer's?
What type of in ground pool is it? (Gunnite, Plaster, Vinyl, Tile, etc.)

[KurtV]

Karen,
Do you have a main drain on your pool? If so, have you closed the valve on that pipe thereby diverting all the suction to the skimmer? Is is possible that your main drain has something on it or in the pipe that is keeping you from getting suction there?

[karenkr]

Thanks everyone for your input.
Answers to questions: I really dont know if we have a main drain or not. Where might it be located? When we partially drained the pool -- just used a small pump.
Only have one skimmer
I have been told the pool is gunnite.

Boughr a new head at walmarts today--going to try that tomorrow
Again thanks
Karen

[curlysue121350@yahoo.com]

I had similar problem last year. the brushes on the bottom of the vacumn head were worn down. once i replaced the brushes no more sticking.

[tenax]

karen,i find i can lose prime while vacuuming if 2 things occur:

a)my main valve is closed (so water is only going through the skimmer and hence the vacuum..so if the vacuum, or vacuum line is plugged,you lose prime) you can leave your main valvel completely open or partially if it decreases your vacuum suction too much and that way you won't lose the prime.

b) if my basket in the pump itself is full of gunk. in which case, obviously doesn't matter which valves you have open and closed or how much given it's one line going into and out of the pump!

check both of those things out. at start of season is when i tend to lose prime because the bloody basket keeps filling up with muck from the winter (leaves, sediment,little twigs,etc..hence why i'm buying a leaf cover for the fall)

[karenkr]

Thanks
Will check both those things.

Will just keep watch on prime to make sure does not go completely dry.

Sure appreciate all your help
Karen