By Pentair Pool Products



Model # 011555

Alternate Part #'s PEN011555, PUR-05-191

Product Description

Inyo Recommended Filters

4000 Series D.E. filters can easily keep pools crystal clear. They’re engineered to provide high efficiency filtration and long runs with a minimum of maintenance. And when occasional maintenance is required, you’ll appreciate the safe, user-friendly design of the tank’s clamp ring, and the ease with which filter grids can be removed for cleaning.

Model SMBW Sheet molded fiberglass tank, 2 in. threaded female connections with Noryl rotary backwash valve.

Featured Highlights:

  • Maximum Operating Pressure 50 psi


  • Corrosion-resistant 20 in. diameter fiberglass filter tank for strength and durability


  • Unique Spiro-Mite grid design provides high efficiency filtration and longer filter cycles


  • Exclusive clamp ring design is proven to be safe, strong and reliable. It allows for quick and easy access to internal components


  • 2 in. plumbing connections provide maximum flow

For More Pentair Filters

Product Specifications

Multiport Valve:
2 in.
Filtration Area:
47 sq. ft.
Flow Rating:
94 GPM
DE Required:
4.8 lbs.

?     Asked on 2/11/2021by Harma

Hello, i have a Purex 4000 SM filter, i only have an item number on the bottom of the tank which is 197126. I would like to know how much DE should i add to my filter on a complete wash. Thank you!

A  Answered on 2/15/2021 by InyoPools Product Specialist Hector F.

Hello Harma, unfortunately, we cannot confirm the sq. ft. model that you have based on the base part number however if you measure the height of the unit and use this datasheet then you will be able to confirm the amount of D.E. the filter will need total. 

?     Asked on 1/30/2021by Ted

I have a SMBW 4048 pentair filter and the rotary valve on the bottom is extremely hard to open and close. Is this replaceable or would it be better to order a new one? Thanks

A  Answered on 2/4/2021 by InyoPools Product Specialist Hector F.

Hi Ted, this will depend on the model multiport valve that is there. Could you send us a few photos of it or provide the model number? To supply photos simply click the reply link below and upload your photos or quickest provide this information using our live online chat feature. Once we get those photos we can make the proper recommendation.

  • Commented on 2/4/2021 by Product Owner

    This is the filter. I replaced the valve before and the gasket was a real tight fit and I'm not sure the gasket was moved during the installation. It was very hard to get the valve and the gasket to push down in the hole of the filter.


    • Commented on 2/9/2021 by InyoPools Product Specialist Hector F.

      Hi Ted, the complete valve rotor for the Pentair SMBW series filter is part number 4675-01A.

?     Asked on 4/2/2020by Hamades pool service

What are the dimensions of the filter?

A  Answered on 4/2/2020 by InyoPools Product Specialist Lennox H.

Hi, Use this link to view the Product Dimensions

?     Asked on 1/13/2019by Joe

How to remove the bottom monifold to clean the dirt at the bottom inside of SMBW 4048?. I tried very hard to pull the manifold, but it did not moved at all. Maybe there is a screw to remove or a twisting motion to be done, or anything else?

A  Answered on 1/14/2019 by InyoPools Product Specialist Lennox H.

Hi, Joe. Before the Bottom Manifold can be removed, the center rod will first have to be removed. 

?     Asked on 6/10/2017by scott williams

Does this come with cartridges?

A  Answered on 6/10/2017 by InyoPools Product Specialist Lennox H.

Hi, Scott. This unit uses grids not cartridges and they're included with the unit.

?     Asked on 8/16/2016by Ernie

The pump is shooting dirt back into the pool thru the jets

A  Answered on 8/17/2016 by InyoPools Product Specialist Alan M.

Hello Ernie, It is very likely that one of your grids are damaged and is in need of replacement. It is also possible that your manifold, that the grids fit into, is damaged. You can view the Purex 4000 Series Molded D.E. Parts list by clicking on the link. The available parts are listed below the diagram and can be ordered directly off of our website. If you need additional assistance, you can always contact us at 1-877-372-6038.

?     Asked on 7/8/2016by Mike

Series 4000 what holds the center rod in place at the bottom of the filter ?

A  Answered on 7/13/2016 by InyoPools Product Specialist Lennox H.

Hi Mike, The center rods are kept in place by the Holding Wheel and Manifold.

?     Asked on 5/18/2016by Jerry

How do I change the gasket on Valve at the bottom of the filter? I have everything out of the filter body and have unscrewed the valve handle at the bottom outside of the filter.

A  Answered on 5/22/2016 by InyoPools Product Specialist Lennox H.

Hi Jerry, Instructions are located on page 5-6 of the Pentair Filters 4000 Series Owners Manual

?     Asked on 4/28/2016by Jose

Does the filter come with the interior grids? Which would be 8

A  Answered on 4/28/2016 by InyoPools Product Specialist Lennox H.

Hi Jose, This filter is sold as a complete unit with the grids inside.

?     Asked on 7/20/2015by JOHN


A  Answered on 7/21/2015 by InyoPools Product Specialist Hector F.

Unfortunately we do not carry these complete element assemblys.

?     Asked on 7/20/2015by john

I have a PUREX TRITON 4000 SERIES pool filter and require a new cartridge for it. do you sell this item and what does it look like? my cartridge is like a multi-webbing structure

A  Answered on 7/20/2015 by InyoPools Product Specialist Hector F.

Yes we do sell these filter elements. There are a few models each with different lengths. You can view the three here on key 8 on this Purex 4000 Series Molded D.E. Parts diagram.

?     Asked on 6/22/2015by Inyo Visitor

Is this system quieter than my 15 year old Pyrex 4000 series DE 48 lb

A  Answered on 6/24/2015 by InyoPools Product Specialist Lennox H.

Hi, Filtration systems does not have any moving parts so whatever sound that comes from the filter will be the sound of water  flowing through the unit.

?     Asked on 5/12/2015by Dan

I currently have a Jacuzzi Earthworks EW100 DE filter. Parts are becoming VERY expensive, if even available, so I'm thinking of replacing it. This Pentair looks very similar in form, fit, and function, but I don't have specs for the EW100 to compare. I do know the EW100 is 45 sq ft of filter with 90 GPM (from the label), and it has done a good job on our approx 35,000 gal built-in. Would the Pentair 4048 would be a good replacement for the EW100? Any other thoughts you'd like to chime in with?

A  Answered on 5/13/2015 by InyoPools Product Specialist Wes B.

Hi Dan, The Pentair Filter - 4000 Series SMBW4048 D.E Filter 48 Sq. Ft. W/ Valve will be very close to the one you currently have. This current Pentair is a 48 sq ft and rated for 94 GPM.

?     Asked on 4/29/2015by Tim

The add indicates a valve is included. Is this the Pentair hiFlow backwash valve?

A  Answered on 4/29/2015 by InyoPools Product Specialist Robert M.

Hello Tim - The valve that is included is a resin rotary valve located at the bottom of the filter.