Filter sucking itself in!
- Thread starter frank411
- Start date
- May 3, 2014
- 58,691
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
OK -- So when the pump shuts off, that check valve is a closed at the highest point of the system. That creates a vacuum on he filter side. Like JamesW, I am surprised it is enough to create your issue.
I would consider moving that check valve. Most likely to before the pump inlet. Others can check me on that.
I was under the impression the check valve was needed to keep the salt/chlorine from going back into the heater.
Also this happened the first time right after build. Which was before the heater/check valve was installed. Heater check valve installed 2 months ago.
- Jun 7, 2017
- 9,159
- Pool Size
- 29000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Aquapure 1400
You can open up the check valve if it is the Jandy style and remove the "guts" which will just make it a pass-through for water. If you are going to do any cutting you could always add in a vacuum/pressure gauge combo after the filter just to see what is going on.
- Jun 7, 2017
- 9,159
- Pool Size
- 29000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Aquapure 1400
You don't really need a check valve with a SWCG since when it is off, it does not produce chlorine and when it is on, the chlorine it produces flow into the pool. Check valves to keep heaters isolated from chlorine are needed with the puck feeders. Can you show a larger picture of all of your equipment?
Silly question but is there anyway they connected the filter before the pump? I dont know enough about the valves to know of thats even possible but might explain the vacuum?
It looks like there's a check valve on the suction. A check valve on the return wouldn't make any difference because the water has to flow towards the pool. So, check valves would not help.
The instructions for installation don't say not to put the filter above the pool. So, it should be covered under warranty.
I would not accept a replacement since it has happened twice. That indicates that it's a design issue and not specific to an individual filter.
The instructions for installation don't say not to put the filter above the pool. So, it should be covered under warranty.
I would not accept a replacement since it has happened twice. That indicates that it's a design issue and not specific to an individual filter.
That's a thermoplastic filter body,s so it's pretty flimsy, but I'm surprised like the rest that it collapsed. However I can see it happening under the right circumstances.
Having said that, given the manufacture of the vessel, I wouldn't be afraid to run the pump. Be aware that it's likely to resume original shape when you start the pump, but don't be alarmed by that.
Having said that, given the manufacture of the vessel, I wouldn't be afraid to run the pump. Be aware that it's likely to resume original shape when you start the pump, but don't be alarmed by that.
I would be concerned about excessive structural fatigue with the daily flexing.
If you install a vacuum breaker, that should fix the problem.
If you install a vacuum breaker, that should fix the problem.
Could this be a problem with the MPV? How is the quality of your water? Is the filter catching debris? When was the last time you backwashed?
Most likely, it's just too much suction for the filter. The temperature of the tank will make the plastic more pliable.
A good quality vacuum breaker should solve the problem. It holds against pressure but will open when there is suction.
A good quality vacuum breaker should solve the problem. It holds against pressure but will open when there is suction.
It seems that w the heat temps in excess of 90, and when the pump is off and the filter positioned higher than the pool, the water being pulled back down to the pool is causing the vacuum to suck the water down and cave in the filter I would also check the inbound side of the filter is clogged or has debris that is actually acting like a check-valve. Once the pump comes back on, it reduces the suction by pushing the water through thus pushing out the filter while the pump is running; opposite while the pump goes off..the excessive heat could be exacerbating the matter...
Ok so I just got the courage to turn it back on lol. And it returned to original shape. Yay I guess? Pentair so far giving me the run around. Builder wants no part in it. What to do now? See more pics attached.
Put a T on the return and reduce to 1/2" and screw in a vacuum breaker like this.
www.supplyhouse.com
0556030 - Watts 0556030 - 1/2" LFN36M1 Lead Free Water Service Vacuum Relief Valve
Watts 0556030 - 1/2" LFN36M1 Lead Free Water Service Vacuum Relief Valve - Series LLFN36 Lead Free Water Service Vacuum Relief Valves are used in water heater/tank applications to automatically allow air to enter into the piping system to prevent vacuum conditions that could siphon the water...
www.supplyhouse.com
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Thanks for your help. I am researching the vacuum breaker thing. i ran it overnight and it shut off around 4am and the caving In did not happen this time. Definitely appears to also be heat related. Did a backwash this morning, but gauge only went from 20 to 10 psi after backwash and pump turned off.
2 Dumb questions.
How do I change the air pressure gauge? It looks to me like its glued on. Unscrewing and remove glue shouldn't be a big deal right? It won't break anything?
How do I bleed excess air from this sd80 tank? I don't think it has a place. In that case what to do. would turning the multiport to backwash suffice?
2 Dumb questions.
How do I change the air pressure gauge? It looks to me like its glued on. Unscrewing and remove glue shouldn't be a big deal right? It won't break anything?
How do I bleed excess air from this sd80 tank? I don't think it has a place. In that case what to do. would turning the multiport to backwash suffice?
The pressure gauge just unscrews from the multiport. It's probably pipe paste on the threads.
There should be a thumbscrew on the opposite side from the gauge on the multiport to bleed the air off. Be careful when unscrewing it as it will wet you.
There should be a thumbscrew on the opposite side from the gauge on the multiport to bleed the air off. Be careful when unscrewing it as it will wet you.
I would install a 1.5" T on the horizontal pipe from the pump to the filter with the hole pointing up. Then, glue in a 1.5" slip x 1/2" female thread reducer bushing. Then, screw in the vacuum breaker.
The check valve in front of the pump should keep the pump from losing prime.
You could add an additional check valve on the line between the pump and the filter before the vacuum breaker to help ensure that the pump does not lose prime.
The check valve in front of the pump should keep the pump from losing prime.
You could add an additional check valve on the line between the pump and the filter before the vacuum breaker to help ensure that the pump does not lose prime.
Watts 1/2 in. Brass MPT Vacuum-Relief Valve 1/2 LFN36M1 - The Home Depot
This lead free vacuum relief valve is suitable for low pressure steam and water service, and is ideal for use in domestic water heaters and supply tanks. This valve automatically allows air to enter into
www.homedepot.com
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