Question about Pentair Sand Dollar 19" Filter with 1 Hp Dynamo Pump System Fil Pen 145148

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Sand dollar sand filter has great pressure on backwash but has very low pressure on filter then after a short time does not have any pressure water does not move at all. I changed sand and cleaned latterals

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  • lizunkle May 21, 2009

    I have the exact same problem. My filter is new.

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  • 83 Answers

Generally, if the filter loses pressure in the filter mode, you have an air leak somewhere. When the filter is low on pressure, check your pump basket area. If there is air in the basket, that is the problem. It could be a bad o-ring under the basket lid, or the air release on the valve, but it will need to be found. Check for drips around the equipment also.

Posted on Jul 10, 2009

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Posted on Jan 02, 2017

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Tip

Backwashing A Sand Filter with A Push/Pull Slide Valve or Multiport Valve


Lots of people are first time pool owners and pool professionals forget to teach these "newbies" about the simplest aspects of pool ownership.

One of the biggest questions we receive from new homeowners is "How do I go about backwashing my sand filter exactly?"

It doesn't matter if you have a Hayward, Pentair, Jandy, Sta-Rite or any other number of Sand Filters on the market they all utilize the same basic valves for backwashing; a push/pull slide valve or a multiport valve.


To backwash with a multiport valve:
1) Shut off pump motor.
2) Press down on valve handle, rotate valve from FILTER to BACKWASH position.
3) Roll out any backwash hose or open any waste line valves.
4) Open air bleeder assembly on filter, and turn pump on.
5) Watch pressure gauge for backpressure and hose for kinks. Be prepared to shut off pump quickly.
6) After hose fills with water, run for 3 - 5 minutes or until water runs clear.
7) Shut off pump motor and move multiport valve handle to RINSE position. Run on rinse for 15 - 25 seconds.
8) Shut off pump motor and move multiport valve handle to FILTER position.
9) Turn pump back on and note lower pressure.
10) Roll up backwash hose so the dogs use it as a chew toy.


To Backwash a sand filter with a slide valve:
1) Shut off pump motor, roll out backwash hose.
2) Twist to unlock plunger T-handle, push or pull(depending on manufaturer) the plunger 2" - 3".
3) Open air bleeder assembly on filter, and turn pump on.
4) Watch pressure gauge for backpressure and hose for kinks. Be prepared to shut off pump quickly.
5) After hose fills with water, run for 3 - 5 minutes or until water runs clear.
6) Shut off pump motor and push T-handle back down into locked position.
7) Turn pump back on and note lower pressure.
8) Roll up backwash hose.

Now you are a backwash Guru!

More tips and tricks are available form The Ugly Pool Guy, www.WeFixUglyPools.com

on Dec 14, 2010 | Pool & Spa

3 Answers

At what pressure should you backwash a sand filter


The back pressure at which it's time to backwash a sand filter is about 6-8 psi above the baseline pressure of a clean filter. Just after following the procedure to backwash and rinse your filter, check the sand filter's back pressure at the time you return the pump and filter system back into filter mode. This is the baseline pressure of your clean filter. As the filter gathers particulates from the pool water, the back pressure will rise over time, as indicated on your pressure gauge. Once the pressure reaches 6-8 psi above the baseline, it's time to backwash.

Some advice: Don't assume the baseline pressure will remain the same for your sand filter. The baseline pressure will change over time and when the sand media is replaced. Typicallly baseline pressure will go up slightly over a season due to captured particles that are difficult to backwash out. Use of a filter cleaner will help remove these captured particles.

More advice: Even with the use of filter cleaners and proper backwashing, sand media will not last forever. The constant water flow and movement of particles in the sand over time shears the surface of each little sand grain. Like a river flowing over rocks, over time each sand grain surface is smoothed, and thus its effectiveness for capturing small particles is reduced with ongoing use. A typical rule of thumb is to replace the sand media +/- 5 years. Some pool owners do it more often, some less. It depends on how long your pool season is each year and how much debris the filter much extract from the pool water.

Jul 16, 2014 | Hayward SAND FILTER, PRO SERIES

1 Answer

How to use backwash to waste


When the filter get clogged the pressure in the filter increases and there is less water flow returning to the pool.
If your filter is a sand filter, when you turn the valve to backwash and turn on the pump it reverses the water flow in the sand filter to flush the dirt out of the filter to waste. Look at the window openning in the waste pipe and keep the backwashing goinging until you see clear water.
Then turn off the pump and move the control valve to Rinse, turn on the pump for a few minutes, this returns the water flow back to normal but the water goes to waste to make sure the sand filter is clean.
Turn off the pump and move the control valve to filter and turn on the pump. This mode is the normal operating mode and the pressure gauge in the sand filter will show a drop in pressure.
Some pressure gauge shows a red section to indicate when backwashing should be carried out.

May 02, 2012 | Hayward Pool & Spa

1 Answer

Does this pump Dynamo DYN 11-n1-1 serial no 1-23-JO9 have to be backwashed and if so...how?


Pumps don't need to be backwashed, some filters do. Sand and DE filters need to be backwashed when the filter pressure has increased to 10 or 11 psi. depending on the manufacturers recommendation. The cartridge filter cannot be backwashed but instead it is removed and a hose sprayer is used to clean out the dirty outside. Your pump does need to be primed so it is not trying to pump mostly air. Each time the pump basket area is low in water then it needs to be primed. You will know how low it can go before it needs to be priming by turning it on when it is low and if it cannot start pumping water at full rate then at that level of water it needs to priming. If it is pumping water at full flow and you turn it off it should not need re-priming because there is enough water in it to force the air through the system. I hope this helps.

Aug 14, 2011 | Dynamo ABOVEGROUND POOL PUMP - 3/4HP -

1 Answer

Have a Hayward side mount pro series sand filter. Just recently the top lid has been popping off . Clamp appears to be in good shape. getting a pressure build up. Any thoughts on the cause/


A pressure build up, indicates several possibilities: 1. An obstruction or closed valve after the filter. 2. A clogged filter. If your filter is equipped with a multiport valve, try the valve setting in the backwash or bypass settings and see if the pressure changes. in the bypass setting, if the pressure remains, you have an obstruction or closed valve after the filter. if the backwash setting causes the pressure to drop, you either have a seriously clogged filter or an obstruction or closed valve after the filter. Assuming the sand is less than 2 years in place, have you checked the sand condition by digging down into the sand deep and checking to see how much debris is still in it? Sand filters DO NOT backwash everything out and will build up over time, requiring a complete dump, clean and refill with fresh filtration sand. If you take the time 1 or twice a season to manually stir up the sand and then backwash repeatedly after stirring it up, you can keep the sand in place for several more years of service. If you live in an area with hard water, it is not unusual to see the sand turn hard like concrete and have to be replced after only a couple years of use. This is typical when pool water pH is high and proper maintenance of the chemistry is neglected. As to the lid popping off, this means the pressure is excessive or the clamp is damaged.

Another point to consider if the condition of the pressure gage... is the reading accurate? In most cases the reading should never be higher than 20, ideally, down around 10-15PSI on clean. Any reading higher, indicates a dirty filter or obstruction after the filter.

Aug 11, 2011 | Hayward SAND FILTER, PRO SERIES

2 Answers

Low water pressure coming out after pump is on


Check skimmers, pump strainer basket and filter pressure. If filter pressure builds. time to backwash the filter. Also, the impellar on the pump might have debris in it...

Jun 06, 2010 | Hayward SAND FILTER, PRO SERIES

3 Answers

Pressure up past 15 or 20 shortly after


The sand is clogged and needs a backwash or change.

May 25, 2010 | Hayward Pro Series 18" Above Ground Pool...

1 Answer

My pool sand filter pump isnt filtering the water


sounds like the sand has clumped together inside filter. you can open filter and replace sand charge or dump into wheel barrow loosen sand and flush clean with hose and put back in

May 13, 2009 | Pentair Sand Dollar 19" Filter with 1 Hp...

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