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I have a Purex Triton Nautilus FNS DE filter. I need to get the grids out to find a leak. I removed the two long bolts - what else need to be detached/unscrewed to get the grid cap off?

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Posted on Jan 02, 2017

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SOURCE: How do I backwash my Pentair Vertical Grid DE filter?

For instructions on backwashing and other trouble shooting, you need an Owner's Manual. You can find one online at the following link:

http://www.pentairpool.com/pdfs/FNSPlusVerticalGridDEFilterOM.pdf

The way you backwash this filter is easy once you get the hang of it!

The first thing you will do is turn off the system, change the valve position to the Backwash position. If you have a Multiport Valve, you will press down on the handle and spin it so that the knotch is pointed to BACKWASH. If you have a Slide Valve, only has two positions, up and down, you turn the handle so that the metal pin is out of the holder and move the handle in the opposite direction. You will need to turn the handle to lock the pin into position.

Once this is done, you will turn on your pump. Pentair recommends that you backwash for 1 minute, then turn off the pump.

If you have the Slide Valve, you will put it back into the FILTER position and then turn the pump back on for 1 minute. If you have the Multiport Valve, you will put it in the RINSE position and then turn the pump back on for 1 minute.

Pentair recommends that you do this cycle a total of three times, backwash/rinse, backwash/rinse, backwash/rinse. AFTER the third time, you will need to open the Air Release Valve at the top of the filter while the pump is OFF and the valve position in back on FILTER. Once this is done, turn on the pump. When you have a steady stream of water coming out of the Air Release Valve, close that up. This way you have no air in the system.

Now, you will mix your DE "Slurry" in a bucket. Depending on your model of filter, you will measure out your DE and mix with water to the consistancy of milk. **IF it is just a backwash, you will only add 80% of the original amount of DE. You only add the total 100% of DE when you completely take the filter apart and clean it out.**

You will slowly pour the slurry into the skimmer that is closest to the pump. This will allow the DE to evenly coat the grids in the filter. Wait about 5 minutes and then check the pressure gauge on the filter. Once the PSI reaches 8 to 10 PSI above this number, it is time to backwash.

Posted on Jul 09, 2009

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Need help to re-assemble grits on a Pentair fns 48 filter


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Remove the band clamp on the tank and start the pump for a second or two untill the top pops then open the air bleed to drain the tank and pull top off. There will be two nuts that you remove from the long studs that come through the top manifold . Once you remove these gently turn the manifold back and forth while pulling up on it. When you get it off rock the grids and pull them up. You will need a garbage handy while you do this to put the caked D.E. in. When all the grids are out you acn pull the bottom frame out. and rinse the base by turning the pump on till the filter base fills then shut the pump off and open the backwash and rinse with a hose while it drains out. You can rinse the parts while you do this if your quick enough. If you used a five gallon bucket to put your old D.E. in Turn the manifold upside down and then assemble with your new grids. Seven are the same size one is smaller that one coresponds with the stand pipe and the bottom has a notch for the same. Whild upside down the grids will line up with the bottom frame a lot easer than when righted. with the steel bolts in their holes carefully tilt the assembly to start the nuts on the through bolts. When they are hand tight rite the assembly and finish tightening it all up. At this point you can lube the stand pipe "O" ring and install a new tank "O" ring. Set the assembly back in the tank and replace the top faceing the same direction as when it came off. Replace the tank band clamp and tighten evenly one side then the other if you have two bolts on it till the coils in the springs touch each other. If it's old enough not to have springs on the bolts tighten them till they squeek.Start pump, bleed air out of tank, ck for leaks and recharge the filter. If you take apart like this once a year and clean the grids or after alge problems you should get eight or ten years from the grids. Good luck!

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