By Hayward Pool Products



Model # C751

Alternate Part #'s HAY-05-285, HAYC751

Product Description

Hayward star clear plus cartridge filter offer added quality, value and convenience in cartridge filtration. Featuring a precision-engineered extruded core design, they provide for maximum water flow and superior filtration, while reducing energy costs.  

Constructed of high strength PermaGlass XL material they offer unparalleled performance and durability, and include a 10 year warranty.

Easy to clean cartridge filter element, with extra dirt holding capability. Engineered for durability and long life.


  • In-ground pools
  • In-ground pool/spa combinations


  • New PermaGlass XL™ filter tanks made from extra durable glass reinforced copolymer material to meet the demands of the toughest applications and environmental conditions, including in-floor cleaning systems
  • Single piece injection-molded base and body provides added strength for reliable, corrosion-free performance
  • Single locking knob securely fastens head to filter tank, eliminating bolts or clamps
  • Attractive, durable filter head may be rotated to conveniently position pressure gauge and manual air relief
  • Extra-large cartridge element with new precision engineered extruded core provides extra strength and maximum flow
  • Elevated, filtered water collector and debris sump prevents accidental by-pass of heavy debris to pool when cartridge is removed for cleaning
  • 1 1/2" or 2" FIP or 2" SKT connections for plumbing versatility
  • 1/2" FIP filter drain for fast draining. Also accepts standard spigot valve

Click here for more Hayward Filters

Product Specifications

Port Size:
1 1/2 in.
Flow Rating:
75 GPM
Filtration Area:
75 sq. ft.
Turnover 8 Hrs.:
36000 gal.
Turnover 10 Hrs.:
45000 gal.

?     Asked on 7/23/2020by Kona

I have a 1600 gallon capacity in-ground hot tub, with Pentair SF-N1-3/4A/340037, HP 3/4, 3450 RPM pump. My current filter is Hayward C-1100. I am wondering if this setup is over speced? I need to replace the filter as it is leaking and I was wondering if this 75sq ft filter will suffice (Can I go lower to 50 sq ft filter)?

A  Answered on 11/16/2020 by InyoPools Product Specialist Hector F.

Hi Kona, so there are a few variables to consider when sizing an inground pool or spa filter. Here is a guide that we put together called "How To Size a Pool Filter" that should help. 

?     Asked on 4/13/2019by SAM


A  Answered on 4/16/2019 by InyoPools Product Specialist Michelle B.

Hello, What would be the brand and the model of your current pump? We would need to see if the gpm exceeds the filter so the new filter does not break.

?     Asked on 3/30/2019by Jay

Can this filter be used on above ground pools? I have a 10,000 gal above ground with a Hayward 1 hp sp1580 pump.

A  Answered on 3/30/2019 by InyoPools Product Specialist Lennox H.

Hi, Jay. This size filter will be sufficient if the pumps flow rate is 75 GPM or below. The C900 model is a better fit.  

?     Asked on 3/10/2019by Sandra

We currently have a Hayward Star clear II C-800 body filter tank. I am looking to see if there is an equivalent filter housing for this product. Do you have any recommendations? Thank you!

A  Answered on 3/11/2019 by InyoPools Product Specialist Hector F.

Unfortunately, we do not have a replacement C800 filter body. That would have to be replaced with a C900 series. 

?     Asked on 8/4/2018by Thomas Crandell

Can this filter be used for potable water ? I would like to put it inline on my well to remove sand and silt . My pump is 1 1/2 HP and puts out about 16 GPM . Also my water pressure will never be higher than 20 PSI because it does not feed a pressurized tank.

A  Answered on 8/5/2018 by InyoPools Product Specialist Lennox H.

Hi, Thomas. Based on the info provided, this filter will be sufficient for your application. 

?     Asked on 6/4/2018by JDA

Needing to replace my sand filter, 33’ round above ground, have 1.5hp dynamo pump currently. Would this cartridge filter be a good replacement?

A  Answered on 6/12/2018 by InyoPools Product Specialist Joe S.

Good day, with a 33' round and 1.5hp pump I would recommend at least a c900 unit.

?     Asked on 8/10/2016by theprofessor

hello! i'm looking at the 751/900/1200 filters... (1.5in inputs). do these filters utilize the same base? i ask because we will likely be installing a larger pool in the near future and it'd be nice to "plumb once" and swap out the top part (and small bits) of the filter housing if we were to move from the 751 to the 1200 (or from the 900 to the 1200)... rather than re-plumb an entirely new filter housing.

A  Answered on 8/10/2016 by InyoPools Product Specialist Scott W.

They have the same base but I'd recommend just purchasing the C1200. A bigger filter than you need right now is not going to hurt anything on your current system, and then when you get a bigger pool you already have the bigger filter. Then you wouldn't have to spend the extra money purchasing an additional filter.

?     Asked on 6/20/2016by Inyo Visitor

I have a inground vinyl pool. 16x32 21,100 gals calculated gpm=45.8 what size/model Hayward cartridge filter do i need. I currently have DE filter but dont want the hassle of DE anymore. thanks

A  Answered on 6/20/2016 by InyoPools Product Specialist Scott W.

I'd recommend at least 120 sq ft filter which is C1200 for that size of pool. The 175 sq ft would be even better if you're looking to do less work with your filter. That part number is C17502 and with a bigger filter you won't have to clean as much.

?     Asked on 6/11/2016by GeoFF RAE

the dial reads 21. what does this indicate?

A  Answered on 6/22/2016 by InyoPools Product Specialist Lennox H.

Hi, That indicates the amount of pressure inside the filter.

?     Asked on 6/1/2016by Jerald

I am looking to purchase a 28ft round pool in the ear future and would like to know what would be the best most efficient cartridge filter/pump system to run with that pool?

A  Answered on 6/8/2016 by InyoPools Product Specialist Lennox H.

Hi Jerald, The Hayward CC10092S is a good package for that size pool.

?     Asked on 4/30/2016by john

what is the replacement for Hayward filter tank body c1100?

A  Answered on 5/2/2016 by InyoPools Product Specialist Lennox H.

Hi John, Either the CX1100RE (O.E.M.) or NFC1290 (Generic) will work as replacement for the C1100 filter.

?     Asked on 3/27/2016by John Rowse

I have a C751 Hayward Cartridge Filter, I keep hearing a rumbling noise in filter when power isturn off. It sounds like it is loosing air in the tank. Have replaced the 0-Ring on locking knob, and 2 fibre washers and also replaced directional vent valvw w/o-ring. Can you help with this problem.

A  Answered on 3/28/2016 by InyoPools Product Specialist Hector F.

For something like this there are multiple possible reasons. What is occurring is air is being released from the system causing loss of pressure hence water flowing back into the pool. This could be caused by bad o rings, seals, or valves. A tech on site is your best option to go through the process of elimination.

?     Asked on 9/12/2015by John

What Hayward cartridge filter system would you recommend for a 10,000 gallon in ground pool?

A  Answered on 9/15/2015 by InyoPools Product Specialist Robert M.

Hello John - For residential pools, the C751 would be suitable for a 10,000 gallon pool as long as your pump does not provide more than 75 gallons per minute.

?     Asked on 6/13/2015by e.mckinlay

can you tell me why I cannot remove the top of my filter housing, it screws off so far then it just keeps clicking and move any further . thanks for any help you can give me.

A  Answered on 6/17/2015 by InyoPools Product Specialist Lennox H.

E.McKinlay, It sound like the Locking Knob (CX900G) is stripped. What you will need to do is once you unscrew the knob to the point it keeps clicking, keep lifting the filter lid until it is free.

?     Asked on 6/10/2015by ED

I have a 5,000 gal. 15'x48" vinyl pool with a 3/4 HP pool pump. Will this filter work or is it to big. Looking for an inexpensive Quality cartridge filter. I have a Waterco 25 that is in bad shape.

A  Answered on 6/10/2015 by InyoPools Product Specialist Patrick P.

Hi Ed, this would be a perfect filter for a 5,000 gallon pool using a 3/4 HP pump. I would feel comfortable suggesting this filter for your pool set up.

?     Asked on 4/24/2015by Inyo Visitor

Is this NSF approved?

A  Answered on 4/24/2015 by InyoPools Product Specialist Robert M.

The C751 is not NSF approved. The Hayward model C100S is NSF approved.

?     Asked on 12/24/2014by jaime

Does the cartridge come with the filter?

A  Answered on 12/24/2014 by InyoPools Product Specialist Alex V.

Jaime, Yes the cartidge comes with the filter.

?     Asked on 10/1/2014by Guest

Are there specs on how many microns this filter is rated at? Is there available another filter that won't allow finer particles to pass through?

A  Answered on 10/1/2014 by InyoPools Product Specialist Patrick P.

As a rule, sand filters sift particles ranging from 20 to 40 microns in size.  Cartridge filters can sift particles as small as 10 to 20 microns in size.  DE filters can sift contaminants as small as 1 to 3 microns in size. This makes DE filtration at least five to six times more efficient than sand filtration systems.

?     Asked on 12/10/2007by Guest

Hi, Is the Hawyard C-751 Star Clear filter the replacement for the C-750?

A  Answered on 12/10/2007 by InyoPools Product Specialist Patrick P.

Yes the C751 would be the replacement the older the C750, the port location on the C751 is slightly different so if you would be replacing the entire filter housing you may have a little bit of re plubming required. You may view or purchase the C751 through this link If you are just requiring the replacement cartridge for the C750 you may view or purchase this item through this link

?     Asked on 9/21/2006by Guest

Does this come with the filter cartridge and gauges?

A  Answered on 9/21/2006 by InyoPools Product Specialist Patrick P.

This filter comes direct from the manufacturer and includes the cartridge and gauges.


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