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How do you backwash Pentair FNS 48 - Pentair Pool & Spa

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If you have a piston BW valve shut the pump off twist the handle and pull up till you can lock in the full up position then turn pump back on. Water will run clear then cloudy, run till it turns clear again.
If it is a dial valve, always shut pump off before moving valve. Then push down on handle and turn 180 degrees then follow directons from above.
Some DE filters won't have BW valves and you will just need to break down the filter and clean by hand. You can follow directions in your manuel for this.

Posted on Sep 04, 2010

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Posted on Jan 02, 2017

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Ready to Burst?


sunlight does weaken fiberglass you might be able to just buy the tank or shell a pool retailer should have a parts breakdown and availbility

Mar 19, 2014 | 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

2 Answers

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...

1 Answer

Fns plus vertical grid de filter plumbing diagram from pump


the front is the inlet from pool the top is out and goes into the filter the filter out goes to the pool returns

Dec 30, 2012 | Pentair Fns Plus 48 sqft De Pool Filter...

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

The filter was backwashed the filter and tnen set on filter adding the powder and the powed er started coming out the return line? what is wrong/ I would like to know how do you clean the filter it was...


You probably have holes in your grids and will need to replace them. You can find a manual at http://www.pentairpool.com/index.htm
Just follow the menu's to get to filters and manual's be sure to have your model number.

Sep 05, 2010 | Pentair Fns Plus 48 sqft De Pool Filter...

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