Question about Pentair Fns Plus 48 sqft De Pool Filter (In Ground Pool)

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Fns plus vertical grid de filter plumbing diagram from pump

Does plumbing from pump go to inlet or outlet

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  • Pentair Master
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The front is the inlet from pool the top is out and goes into the filter the filter out goes to the pool returns

Posted on Sep 07, 2014

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Posted on Jan 02, 2017

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adamh294
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SOURCE: Our fns plus pool filter

You may either replace the air relief valve, or plumb in a check valve so that the water cant backflow

Posted on Apr 05, 2011

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SOURCE: Pentair 48 FNS filter, all new grids and top still won't backwash....pool is cloudy....what's the trouble???

COULD BE TOO MUCH CHLORINE.

Posted on Jul 14, 2012

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


start with the short one by where cut out is for pipe arrange then put back together see manual if you dont have manual check pentair site or send me more info ill try to help

Nov 02, 2013 | Pentair Fns Plus 48 sqft De Pool Filter...

Tip

Changing from a Pentair FNS DE Filter To A Pentair FNS Plus DE Filter


If you are the proud owner of a Penatir FNS DE filter, it may be nearing the time when you will be upgrading to a new filter. Since your first filter has probably been a great performer, you will be considering keeping the same brand of filter.
Ironically, since Pentair is trying to do away with the FNS filter, you may find that the FNS Plus is actually more affordable, and with the minor changes that have been made, is a an even better filter.
So, how do you avoid costly plumbing expenditures in changing out this filter? The FNS actually has the bulkheads (the connections where the backwash valve union nuts) that sit 1/4" lower than the standard FNS filter. In order to avoid having to change the plumbing for the backwash valve (although it is always recommended you change the valve when you install a new filter), you need to bring the filter up that 1/4" to make the bulkhead fittings line up.
Pictured below is a filter and the two kinds of valves that are used with the filter. On the left, the two black "dots" on the front of the filter are the bulkheads. On the right, you will see the two connection ports that the valves use to connect to the filter. Either valve works with this filter (i.e. multiport (left valve) or standard push/pull (right valve).
uglypoolguy_1.jpguglypoolguy_0.jpg
When changing the filter you should need only a large pair of channel locks and some lube. The other important component is a 18" X 18" Ceramic tile. When you install the new filter, first lay down the ceramic tile. This will make up for that 1/4" difference on the bulkhead location and ensure that your filter lines up with your valve! Thats it...no additional plumbing required.
Always remember, before you attempt to do any installation on your own, with anything you are unfamilar with, do your best to find the people who have been doing this for awhile. These little tips and tricks will make the job much easier, and save some aggravation!
The Ugly Pool Guy www.WeFixUglyPools.com

on Dec 14, 2010 | Pool & Spa

1 Answer

I am having problem reassembling filter grits, unable to fit smaller grit


If you have the manifold upside down on the ground, the small grid fits into the second hole to the right of the big standpipe hole. That is the reason for the smaller grid, to allow room for the stand pipe.

Nov 02, 2013 | Pentair Fns Plus 48 sqft De Pool Filter...

1 Answer

I got a pool with a fns plus 60 DE filtering system thats depositing diatomaceous earth all over my pool.Took it apart cleaned the grids bought 2 new ones to replace the bad ones,put it back together...


The FNS PLUS was originally built by American Products under a different name and was absorbed into Pentair's line, recently replacing the PAC-FAB FNS (fiberglass nautilus) also absorbed by Pentair. The two filters have no common background.
The FNS PLUS has been cursed at by more pool techs than I can count. All I can say is practice helps but these are always a pain to get right. Make sure that the narrower of the elements is in the correct spot, the rest do not matter. Also check the manifold on all sides for cracks and make sure the air relief screen is set properly. I wish I had an easy solution for you, but this filter is just a pain, even for the guys that work on them every day.

Aug 23, 2013 | Pool & Spa

1 Answer

Got a fns plus 60 filter grids all cleaned replaced bad ones what is the secret to putting it all put together right can't line the the grids on the bottom template so they match help!!!!!!!!!!!!!!


Make sure that the space in the spreader is aligned with the big hole in the manifold, and that the small grid is 2 spaces right of the big hole. I curse like a sailor almost every time I work on these (FNS Plus), even after 18 years in the business. Your local pool shop should be able to do this for you at no charge.

Aug 23, 2013 | Pentair FILTER TANK BOTTOM, 48 SQFT

1 Answer

When pump starts up i get a small cloud of de in my inground spa every time it starts up. I have had the filter looked at by a pool repairman every thing looks good he is stumped as to this is happing ...


If all your grids are in good shape you have to look at your manifold real close for cracks and around the internal air bleed. When checking your grids be sure the nipples that go into the manifold are also in good shape and when reassembling make sure all fit comfortably and get them tight. Hope this helps, good luck.

Sep 12, 2010 | Pentair Fns Plus 48 sqft De Pool Filter...

1 Answer

I cannot get the filter element cluster to release from the outlet elbow on my Hayward vertical grill filter. Any suggestions?


You did release the catch ... right? It should just lift out ... off the pipe and off the rod holder onthe other side ... wiggle it if necessary.

Aug 07, 2010 | Hayward 48 Sq Ft Pro Grid Vertical Grid De...

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