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That increase is due to the filter loading up with debris. Is the pool unusually dirty? If there is a lot of dirt and silt in the pool use the "waste" setting on your backwash valve while vacuuming. This allows the water to bypass the filter and go directly out the waste line. Keep an eye on your water level because you will be removing water from the pool and may have to add more.
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.
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.
The actual pressure depends on how clean the sand is, how well the pump is pumping, how clean the skimmer and pump baskets are. The rule of thumb would be when the filter pressure raises 8-10 psi above whatever the pressure was when you first started the filter with clean sand, clean baskets, good pump, When it reaches the 8-10 psi, it's time to backfulsh. A low pressue, with adequate return flow is what you really want. See Hayward's web site for a manual. http://www.haywardnet.com/inground/products/manuals.cfm
This can be a few different problems I will list them out for you:
Make sure you are following the instructions in your Hayward owner’s
manual. The sand bed may be clogged with mineral deposits or other
material that will not backwash away. Some calcium based chlorines and
other alternative sanitizers could cause a build-up in your sand bed.
You may need to change the sand.
Before you change the sand in you filter, try removing approximately 1”
of the top layer of sand, and replace with the exact amount of sand
removed. This sometimes rids the sand bed of the deposits clogging
the filter.
You may have to clean you filter system with a special filter cleaner,
check with your Authorized Hayward dealer for proper procedures.
Check to see if there is a closed or partially closed valve on the return piping.
Your pump may be too small to provide sufficient flow for proper
backwashing. Your filter will filter properly, but if your pump does
not supply at least 60% of the filter’s designed flow rate, you filter
will never backwash completely. Refer to the label on you filter for
flow rate requirements. It may be necessary to upgrade the pump or
downgrade the filter.
Your pump may also be exceeding the maximum allowed flow
rate of you filter causing excessive backpressure. Check you Hayward
filter owners guide or the operations label on you filter for the
maximum allowed flow rate. You may have to downsize the impeller or
pump to a lower horsepower or change the filter for one that will
accommodate the pump’s flow rate. If allowed to continue, a pump that
exceeds the recommended flow rate of a sand filter could cause the sand
bed to channel (small channels in the sand that allow debris to pass
unfiltered). This would cause debris to by-pass the filter.
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.
Below is a copy of the users manual for these pool filters. It has a troubleshooting guide and several diagrams that should help you get the pressure problems solved. Hope this helps.
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..
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