High Pressure DE

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indskys
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Posts: 2
Joined: Sun 07 Jun, 2009 16:45
My Pool: 20 X 40 inground...3620de hayward filter
Location: Manchester,NJ USA

High Pressure DE

Postby indskys » Sun 07 Jun, 2009 16:51

I have a Hayward 3620 DE filter and i have been having trouble with it running a short time then needing a back wash..the problem is after i backwash and recharge filter i only get about 1 hour before the pressure is 30 psi..it starts at about 15 psi...so i bought new grids and installed them today I got about 4 hours of run time then pressure was back up to 30 psi..now i have the same problem i had before after back wash i get about 1 hour then the pressure is 30 and the flow is very low...i'm stumped..the pool is about 6 years old and the first seasons i only backwashed a couple a times a year...any ideas


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mr_clean
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Location: So Cal

High Pressure DE

Postby mr_clean » Sun 07 Jun, 2009 18:59

is this pool filled with algae? if yes, it's worse this year and the filter is just catching all of it doing it's job. Backwash when pressure rises & add DE powder back in & know not as much when starting freshly cleaned or it cloggs up faster.

if no algae, how much DE powder are you adding?
I have seen to many people add way to much.

You say you cleaned/changed the grids etc. the DE was on the outside of the grids correct?

have seen people hook up lines wrong with DE powder being on the inside of the grids causing major problems.
indskys
Pool Newbie
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Posts: 2
Joined: Sun 07 Jun, 2009 16:45
My Pool: 20 X 40 inground...3620de hayward filter
Location: Manchester,NJ USA

High Pressure DE

Postby indskys » Mon 08 Jun, 2009 21:29

.5 lbs on fresh startup and about 2lbs after backwash...yeah the pool is cloudy but 1 hr to high pressure seems really quick and the grids are in correctly...14 to 30 lbs in 1 hour...i guess i will see better when the pool is clear if ever...
dj000524
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Joined: Fri 08 Aug, 2008 15:30

High Pressure DE

Postby dj000524 » Sat 13 Jun, 2009 19:57

I am having the same issue. I have a anthony de filter 60sqft. which has center mount verticle grids. Pool is about 12 yrs old and the original owners have changed some things in the filter housing.I bought the house last year and had issues with the filter then. This year I have opened the pool put new grids in. Have backwashed and rinse and added de to the pool. I did have algae at the beginning but all things show that no algae is there but still having high pressure reading after 1hr. I have taken the filter apart and cleaned the new grids along with checking the pipes leading to and from the filter done that today (6/13) and after turning the pump on it started at 18 and w/in 30 minutes was at 30psi. I have even put my multi port valve to recirulcate to make sure there is good pressure to the return jets and there is. Have spoken to several pool people and they are telling me that if a DE filter gets behind it can take several weeks for the pool to clear. At the beginning I was unable to see the second step, but now I can see the third step but thats it. Still cant understand why the pressure builds so fast. I am strongly considering switching to a sand filter.
McPhee1953

High Pressure DE

Postby McPhee1953 » Fri 10 Jul, 2009 06:51

The Pentair FNS Plus DE filter has been working great till this recent heat wave. I ran the filter for about 6 hours and noticed a "cloudyness" to the water. Then after not doing anything for a few days, algae appeared. For 3 days, I've been back flushing ever hour or so. I've even taken the grid out for cleanings. But the pool is still cloudy.
I inspected the Air Bleed Sock, that sits inside on top of the grid with pressure from a hose ... a hole. This is allowing DE to reenter the pool...thus being picked up by Creepy and building the tank pressure up quickly. :?

Have you inspected the Air Bleed Sock-Tube?
waterdog
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High Pressure DE

Postby waterdog » Sun 12 Jul, 2009 19:01

Having same problem. First issue was algae, when I made a mistake last month & turned off filter due to traveling for 4 days. Have finally gotten a handle on it (I think) since what was green is now white but water is still cloudy. I have backwashed yet find that pressure is high so water flow slows to a stop in 1 hour. What I end up doing is braking apart DE filter & washing each grid, which lasts for most of the day. What is surprising is when I backwash the outflow water appears clear.Thinking that DE is clogging the strainer on top of manifold - not sure if this is a problem or what else to do.
dispatch09

High Pressure DE

Postby dispatch09 » Tue 04 Aug, 2009 00:03

First thing everyone needs to do is take the de filter out and see what the pressure is at when you put the everything back together without the filter in the tank. If the pressure goes down, then you have a problem with your filter. Simplify the process, it is a small trick of the trade.
elf

High Pressure DE

Postby elf » Tue 04 Aug, 2009 15:51

so everyone started having this problem when having a green pool from what it sounds like? When this happens depending on how long the pool has been green can affect a DE filter getting high pressure fast.
You can backwash and clean the filter daily but if you do not have your CYA - conditioner level at 50-60 and your chlorine level at shock level 20ppm until clear with running your pool 24/7 your going to struggle with clearing up your pool.
Filter size will also affect how fast a pool will clearup but having a 60sqft DE filter and the preesure rising fast would seem to me its not at shock level everyday breaking down the algae by killing it with chlorine. Just a 3ppm reading of chlorine will not fix a green pool which can take many days to clearup even at shock level.
dispatch09

High Pressure DE

Postby dispatch09 » Tue 04 Aug, 2009 23:05

Does everyone know that you can call the manufacturer of the de filter and they will trouble shoot with you free of charge and they are experts at handling these problems. They handle problems like this all the time. Look on your filter and get the name and model and then look up the name of the filter on the internet unless you already have the number.
czechmate
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My Pool: 16 x 32 gunite21000 gal., Diamond Brite Blue, Swimquip XL pump, DE36
Location: Texas

High Pressure DE

Postby czechmate » Wed 05 Aug, 2009 14:43

First of all, recommending to someone to raise CYA level 50-60 is a complete BS.
Normal range is 35-50. 35-40 ideal. 50 will require FC of 5.5 ppm which is not the greatest for your skin or the packet book. Further back washing algae clogged up DE elements by pool water is a waist of time and money.
You need to take the cover of your DE filter of and see why. Only force of a jet from water hose will strip the elements clean.
There is no shortcuts, except that it will only take half an hour, instead of half a week of dumping conditioned water to a drain without any results. Sure, it is a little messy but it is the only way.
I only backwash to get rid of organic matter that will accumulate by passing through strainers. Maybe 1 minute twice, usually after extra rain with a water that i need to dump anyway. Than I add maybe 2 coffee cans of DE.
When the pressure is 8 psi over the starting pressure I ALWAYS clean the elements one by one by hose.
Otherwise you never know how much total sq/ft surface is actually working in your filter.

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