Darlly Spa And Pool Replacement Filter Cartridge 40104 MSPA B030874 Compatible With MSPA Bubble Spa And Jet Spa Models

Darlly Spa/Pool Replacement Filter Cartridge [40104] [MSPA] B030874 is a direct-fit replacement designed to drop into your spa or pool filtration system without any adapter plates. Built to mirror the original cartridge, this model makes routine maintenance fast and mess-free, so you spend more time enjoying clean water and less time fiddling with hardware.

• Direct-fit, no adapters — swap the old cartridge for this one and restore filtration in minutes. No extra plates or fittings required.
• Twist-lock top, closed bottom — a secure top connection that prevents leaks and simplifies servicing.
• Compact, efficient design — 4-3/8" diameter, 4-1/8" length with about 10 square feet of filtration surface area, delivering solid debris-trapping capacity without unnecessary bulk.
• Raised circle with bayonet twist-lock slots — a dependable locking feature that ensures a tight seal and easy removal when it’s time to replace.
• Wide compatibility — specifically designed to fit Bubble Spa and M‑Spa Bubble Spa systems, including the Jet Spa B0300874 (also referenced as P40104, FC-9921, AK‑B0300874 for cross‑references).

Why this replacement matters: maintaining clear spa water starts with an efficient filter cartridge that fits your equipment perfectly. This Darlly cartridge is engineered to align with international standards, offering reliable filtration performance that supports clearer water, longer equipment life, and less downtime spent chasing incompatible parts. By choosing a true direct-fit replacement, you avoid guesswork and ensure your spa’s pump and sanitation elements work together as intended.

Ideal for: homeowners and hot tub enthusiasts using MSPA/Bubble Spa and Jet Spa configurations who want a straightforward, plug‑and‑play cartridge that matches the original fit and filtration capacity.

Tips for best results: inspect the cartridge housing before installation, ensure the twist-lock top engages fully, and replace the cartridge when you notice a drop in flow or water clarity. Regular, predictable replacements keep filtration efficiency high and reduce the frequency of deep-clean cycles.