Unicel C-8465 | 65 sq ft Hot Spring Spa Filter Type_Igniters Sodium Borate

Sodium Borate

The two issues are addressed with different products

and total hardness with a single dip

where this one is 8 inches with a semi-circular handle and a 1-1/2 inch thread

That's exactly why water can look clear and still benefit from a fresh filter — the difference between "clear" and genuinely polished water happens at a scale you'll never spot by looking

Unicel C-8465 | 65 sq ft Hot Spring Spa Filter Type_Igniters Sodium BorateThe Unicel C 8465 delivers 65 square feet of filtration across 234 uniform pleats, capturing debris and particles down to an average of 20 microns. Built to meet or exceed OEM specifications, it's a direct replacement for a wide range of Hot Spring, Caldera, and Tiger River cartridges. Filtration is the quiet backbone of clean spa water. Every soak leaves behind body oils, lotions, hair, and fine debris, and the cartridge is what removes all of it