★★★★★ 4
Easy to use.
Size: 2+6+1+12 Pack
They work very well.
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Reviewed in the United States on March 8, 2026
Black Knight 4" Dia x 9" Long Filter Brushes - 6 Pack
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
Black Knight 4" Dia x 9" Long Filter Brushes - 6 PackWhat are Black Knight Filter Brushes: Black Knight filter brushes are made from the very highest quality Hydrotek polypropylene twisted into two stainless steel wires to form a cylindrical brush with a loop at one end for hanging. The other end is capped with a plastic knob for safety. They last indefinitely and are the easiest to use, most efficient and most cost effective pond filter medium you can buy. Our brushes are used in filtration systems in
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Your Black Knight 4" Dia x 9" Long Filter Brushes - 6 Pack orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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4.1 ★★★★★
Based on 142 reviews
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Product Reviews
★★★★★ 5
Not so good
Size: 2+6+1+12 Pack
These placement filters are not as good as the original. They seem to hold onto the debris & don't release it into the reservoir. I clean the filter & reservoir after each use & always find the filter full & the reservoir nearly empty.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 24, 2025
★★★★★ 5
Well priced
Size: 1+6+6 Pack
Very economically priced set of replacement parts for Eufy RoboVac 11S Max
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 25, 2026
★★★★★ 5
Perfect fit
Size: 2+6+1+12 Pack
This is the second time I have ordered replacement parts for my Eufy robot vac. They fit perfectly.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 3, 2025
★★★★★ 5
Good value replacement parts package
Size: 2+6+1+12 Pack
Purchasing the Replacement Parts for my Eufy RoboVac 11S Max has proven to be an excellent value for the cost. The kit, which includes brushes and a filter, has significantly extended the life and maintained the efficiency of my vacuum. It's reassuring to know that I can keep my RoboVac performing at its best without the need for costly professional services or a premature replacement of the unit itself. The ease of replacing the parts meant that my vacuum was back to its optimal cleaning performance in no time. For anyone looking to maintain their Eufy RoboVac 11S Max in top condition, these replacement parts are a wise and economical choice.
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Reviewed in the United States on February 28, 2024
