What is the Darlly replacement for Unicel C-7685?

Darlly 77518 replaces Unicel C-7685. Both are 7-1/2" in diameter and about 19-1/2" long.

What size is Darlly 77518?

Darlly 77518 is 7-1/2" in outside diameter and 19-1/2" long, with 105 sq ft of filter area.

Darlly 77518 Pool Filter Cartridge

Replaces Unicel C-7685 · Filbur FC-6110

Darlly 77518 is a 105 sq ft pool filter cartridge, 7-1/2" x 19-1/2". It replaces Unicel C-7685 and Filbur FC-6110.

Specifications

Darlly part number	77518
Outside diameter	7-1/2"
Length	19-1/2"
Top end cap	3-1/2" female thread/FPT
Bottom end cap	2-5/8" Open
Filter area	105 sq ft
Type	Pool
Darlly description	Harmsco SC/TC 105

Cross-reference

Brand	Part numbers Darlly 77518 replaces
Unicel	C-7685
Filbur	FC-6110

Older or other numbers that also point to this cartridge (not confirmed by a second source): RC-PH100/105 (Pleatco).

Questions

What is the Darlly replacement for Unicel C-7685?: Darlly 77518 replaces Unicel C-7685. Both are 7-1/2" in diameter and about 19-1/2" long.
What size is Darlly 77518?: Darlly 77518 is 7-1/2" in outside diameter and 19-1/2" long, with 105 sq ft of filter area.

Where to buy Darlly 77518

Pool and spa businesses in Florida, Georgia, South Carolina, Alabama, Mississippi, Louisiana and Texas order through their Grit Game rep. Everywhere else, contact Darlly Filtration directly.

Find your Grit Game rep Contact Darlly Darlly 77518 on darllyfilter.com

Cross-reference checked October 21, 2026 against Unicel's 2026 Replacement Guide, Pleatco's catalog (updated September 2025), filbur.com and darllyfilter.com. A competitor number is listed only when that brand's own data pairs it with the same cartridge size. Always compare the size and end caps of your old cartridge before ordering.

Brand names and part numbers are trademarks of their respective owners and are shown only to identify compatible replacements. Darlly Filtration is not affiliated with or endorsed by them. Cross-reference by The Grit Game, Darlly's sales agency.