Home Pool Filter Cartridge Replacements Sta-Rite Filter Cartridges Replacement Cartridge Set for Sta-Rite System 3 | 300 Sq Ft | AK-ULTRA7M120
NOTICE: The Texas weather emergency in February, in addition to the ongoing demand increase for pool products from the Covid pandemic, have caused industry-wide shortages on many products that most vendors expect to last late into 2021/early 2022. We're allowing items to be purchased so that customers who choose to wait will have their order shipped when product arrives. Many times there are long shipping delays on the few products we do have in stock. Please contact us to ask about availability. Live Chat and email will get the quickest response. 

Replacement Cartridge Set for Sta-Rite System 3 | 300 Sq Ft | AK-ULTRA7M120

Replacement Cartridge Set for Sta-Rite System 3 | 300 Sq Ft | AK-ULTRA7M120 Replacement Cartridge Set for Sta-Rite System 3 | 300 Sq Ft | AK-ULTRA7M120
This item is currently out of stock.

  • Best Filter. Right Price. Every Day!
  • Crafted of the highest quality materials
  • Removes unwanted bacteria and contaminants
  • Kit includes one small and one large replacement cartridge
Q & A
2 Piece OEM Function with an Adapter-Free Guaranteed Fit
S7M120 - This 300 sq. ft., Pool or Spa Filter , and is 25 1/4" and 18 1/4" long. It is crafted of the highest quality materials; and engineered to be superior. With USA MADE REEMAY, the highest quality fabric that removes unwanted bacteria and contaminants, keeping your water crystal clean.
Baleen Pool and Spa Replacement Filter Cartridges meet or exceed OEM specifications. They install easily, and begin working to clean water immediately. Once you have tried their filters, you will see how they filter out more debris than the other brands, and out last other brands.
  • Guaranteed Perfect Fit
  • Filters bacteria & contaminants
  • Eco friendly filter cartridge
  • Extremely durable - wash & reuse
  • Withstands high pressures & temperatures
  • Energy efficient
  • Easy installation
Set includes:
  • Small cartridge compatible with (25021-0200S)
    • - 25 1/4" Length by 8 1/2" diameter
    • - 100 square feet of filtration capacity
  • Large cartridge compatible with (25021-0201S)
    • - 18 1/4" Length by 16 1/4" diameter
    • - 200 square feet of filtration capacity
Work Harder. Last Longer. Simply the Best.
Reliable End Caps with Fibersteel™ Reinforcement - The molded end caps won’t break down during the entire filter life, guaranteed, even when using salt or high levels of chlorine. And, the guaranteed fit ensures easy installation and removal.
Superior Flow with Aqua Flux Cores - The sophisticated core is engineered to promote and deliver perfect continuous water flow for the life of the filter, guaranteed. Large unrestricted core openings encourage even particle distribution to filter media, which maximizes efficiency.
Exceptional Strength - The durable cores are made with ABS and PVC technology, which is engineered to be tough, impact resistant and withstand even the most extreme pressure, guaranteed.
Built Tough, Easy To Clean - The durable fabric, sharp pleat folds and perfectly placed bands keep pleats evenly spaced for optimum flow, filtration and cleaning; while the unique attributes of our fabric allows for maximum time between filter cleaning and replacement.
When the fabric was tested again against EQUIVALENT COMPETITOR the results were crystal clear
  • 50% Longer run time
  • 125% more stiffness
  • 83% more permeable
  • Better durability and cleanability
Hint: keep an extra filter on hand so that when its time to clean your filter, you will be able to replace it immediately with the back-up.This will allow you the time to leisurely deep clean your dirty filter and allow it to dry completely before replacing it; and without any down time on your pool or spa system.

Square Foot
For (Square Foot) Filter
Q & A
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 2 questions Browse 2 questions
How fast can I get these and can I just pick them up from your Nashville Warehouse?
Tom B on May 19, 2020
I bought a S8M500 set and need a S8M600. Can I exchange it with you? Clark
Clark T on Aug 4, 2019
5.0 / 5.0
1 Review
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
greta service
I have done business with you in the past and this time it was excellent service also. Telephoned, spoke to your rep and he helped me order what I needed since I had forgotten the name of the cartridges. He walked me through it, said when I should receive it, placed the order and within several days it was received. Can't ask for any better service than that, Thanks!
February 17, 2019
over 2 years ago
Hay muchas maneras diferentes de contactarnos, y nos gustaría hablar con usted sobre las preguntas de su compra, ayudarle a diagnosticar los problemas de su equipo y escuchar acerca de cómo podemos mejorar y todo lo que está en su mente.
Click Here
5am - 8pm Weekdays
6am - 6pm Weekends
Pacific Standard Time
Will-Call Hours Click Here
Be the first to know the latest news, deals & special events!


By signing up you indicate that you agree to the terms of our privacy policy.

Pool Supply Unlimited is an e-commerce company that loves water. We love to pump it, filter it, heat it, chlorinate it, light it up and stare at it while we're barbequing a fat, juicy steak. There are real pool professionals working here. Our guys have seen thousands of pools in their careers, no exaggeration. We are based in Southern California and can land most products to your door (within the 48 contiguous states) in less than a week.
Visa Mastercard Discover American Express PayPal