Companion Undersink Replacement Filter Pack

This listing includes replacement options for:

• 3-Stage Companion Undersink systems
• 4-Stage systems with an added carbon filter
• 4-Stage systems with an added nitrate filter

If you are unsure which configuration you have, feel free to reach out with a photo of your system and we will help confirm the correct option.

• Stage 1: Sediment and chlorine reduction filter to capture fine particles and improve taste, odor, and overall water clarity
• Stage 2: Submicron filtration with ion exchange targeting bacteria, cysts, and heavy metals such as lead and arsenic
• Stage 3: Advanced carbon filtration for chloramines, VOCs, PFAS, and other organic contaminants
• Stage 4 (where applicable): Additional carbon or nitrate filtration depending on your system configuration

Replace filters every 6–12 months, depending on:

• Water quality
• Usage volume

Replacement Guide (PDF)

Sanitization Guide (PDF)

In stock and typically ships within 5–7 business days.