Question about Hayward Pro Series 18" Above Ground Pool Sand Filter System with Pump

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Hayward sand filter not filtering small particles

My pressure never builds up to backwash! the flow is always strong! i removed the top and inspected sand and it looked like new !please help my water is cloudy and won't clear completely!

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You probably have too big of pump. It is pushing the finer stuff right back into pool. Try adding a clarifier. Don't backwash either until the pressure goes up.

Posted on Aug 23, 2009

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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

I have a hayward s200 sand filter and there is no pressure build-up to indicate a backwash is needed why


Do you have a strong flow of water back to pool? If so, perhaps pressure gauge is defective, pool water is relatively clean or particles are too fine to be captured except through multiple turnovers.

Aug 17, 2012 | Hayward SAND FILTER, PRO SERIES

4 Answers

When backwashing...sand discharges out backwash hose..


A little sand in backwash is not uncommon. Many packaged sand filter systems use pumps whose flow rates greatly exceed the flow capacity of the filter.(the more horsepower the better, right? - Wrong) If this occurs only during back flush the the pump is too strong or the sand level is above the beginning of the rounded top of tank. The sand level will eventually correct itself.

Aug 10, 2012 | 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

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

1 Answer

We had a lot of rain and mud got in the pool. i vacuumed the pool twice and the third time i vacuumed it, i put the filter on "waste" instead of keeping it on "filter". it cleaned up very well that way...


You may have to change the sand from to much mud. this requires removing the valve from the top and syphoning the sand with a "sand changer" then removing the latterals from the bottom.( they unscrew from the hub inside the filter and cleaning them. Return the correct the amount of sand covering the tube shaft that connects the valve to the hub sot he sand doesnot clog the flow again. Return valve to the top and it should flow freely again.

The Pool Tech

Aug 07, 2010 | Hayward SAND FILTER, PRO SERIES

1 Answer

How to change the sand in the filter


Backwash the filter, drain water from motor etc., remove the dome on the top of the filter. I usually use a shop vac and vac the sand out, not overloading the vac. When all the sand is removed, check the laterals and piping in the filter for cracks, etc. I like to spread washed pea gravel or small rock under the laterals to help support them. Then add about 6 inches of water in the filter. Be sure to get sand of the right grade for a sand filter. Fill it with the recommended amount of sand, smoothing it to keep it level and around all fittings. Do Not fill the filter all the way. There needs to be space between the sand and the top laterals. Close the filter with the dome and be sure to inspect the o-ring on the dome. Put the backwash valve in the backwash position and backwash till clear. Put the valve on "filter" and open the air release valve on the top of the filter to bleed the air and start the pump. The pool may cloud a little but don't worry about it. It will clear as the sand compacts. It is a very labor intensive job...

Jun 15, 2010 | Hayward SAND FILTER, PRO SERIES

2 Answers

Pressure doesn't last & seems to blow out cloudy, dingy water


if you are on city treated water, sand will last aprox. 7 years, if on well water typically 3 - 5 years. so yes, could be a sand issue. also, double check that the there is no water trickling out the backwash / drain outlet of the filter, this could indicate that the diverter valve gasket (spider gasket) could be worn and cause sand from the filter to flow to the pool. this is a common problem if you move the position selector often with the pump still running - the pump should always be off when moving the handle. good luck!

Jun 01, 2010 | Hayward SAND FILTER, PRO SERIES

1 Answer

How to open pool, fill sand filter with water?


I happen to have a copy of the users manual for this pool filter. These are the instructions for operating your filter.

1. Be sure correct amount of filter sand media is in tank and
that all connections have been made and are secure.
2. Depress Vari-Flo control valve handle and rotate to
BACKWASH* position. (To prevent damage to control valve
seal, always depress handle before turning.)
3. Prime and start pump according to pump instructions (be
sure all suction and return lines are open), allowing the filter
tank to fill with water.
WARNING: ALL SUCTION AND
DISCHARGE VALVES MUST BE OPEN WHEN
STARTING THE SYSTEM. FAILURE TO DO
SO COULD CAUSE SEVERE PERSONAL
INJURY.
Once water flow is steady out the waste line, run the pump for
at least 2 minutes. The initial back-washing of the filter is
recommended to remove any impurities or fine sand particles
in the sand media.
4. Turn pump off and set valve to RINSE position. Start pump
and operate until water in sight glass is clear—about 1/2 to 1
minute. Turn pump off, set valve to FILTER position and
restart pump. Your filter is now operating in the normal filter
mode, filtering particles from the pool water.
5. Adjust pool suction and return valves to achieve desired
flow. Check system and filter for water leaks and tighten
connections, bolts, nuts, as required.
6. Note the initial pressure gauge reading when the filter is
clean. (It will vary from pool to pool depending upon the
pump and general piping system). As the filter removes dirt
and impurities from the pool water, the accumulation in the
filter will cause the pressure to rise and flow to diminish.
When the pressure gauge reading is 8-10 PSI (0.55-0.69
BAR) higher than the initial "clean" pressure you noted, it is
time to backwash (clean) the filter (see BACKWASH under
Filter Control Valve Functions.)

Apr 16, 2010 | Hayward SAND FILTER, PRO SERIES

2 Answers

Sand filter not catching little debris


Filter is being bypassed at backwash valve, due to poor spider gasket in valve, or there is a broken lateral in bottom of sand filter, causing debris to return to pool..

Feb 18, 2009 | Hayward Pro Series 18" Above Ground Pool...

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