iSpring RCC7AK Replacement Filters: Complete Guide

iSpring makes filter replacement easy with pre-packaged sets by duration. Here's the complete schedule, which set to buy, and how to keep annual costs as low as possible.

Filter replacement schedule

Stage 1: PP Sediment	Every 6–12 months depending on water quality
Stage 2: GAC Carbon	Every 12 months
Stage 3: CTO Carbon Block	Every 12 months
Stage 4: RO Membrane	Every 2–3 years
Stage 5: Post-Carbon GAC	Every 12 months
Stage 6: Alkaline (AK) Filter	Every 12 months

Which replacement set to buy

iSpring packages filters into sets so you replace everything at once rather than tracking individual stages:

F4AK — 6-month set	Pre-filters + alkaline filter. Good for heavy users replacing pre-filters more frequently.
F9K — 1-year set	The most popular. Includes all stages for 12 months of typical use.
F19K75 — 2-year set	Includes RO membrane replacement. Best value per filter.
F28K75 — 3-year set	Lowest per-filter cost. Stock up and save.

Recommendation

Buy the F9K 1-year set — most practical for most households

Order once a year, replace everything in one session, done. The 2-year set (F19K75) is the best value if you want to stock up.

iSpring F9K 1-Year Filter Set on Amazon →

How to replace iSpring RCC7AK filters

Turn off the cold water supply valve under the sink
Press the colored release buttons on each filter housing to remove them
Discard old filters
Insert new filters — they are color-coded to match the housing
Turn the water supply back on and check for leaks
Flush the system for 10–15 minutes before drinking

How to know when filters need replacing

Use a TDS meter. Fresh RCC7AK output should read 10–30 TDS from typical municipal water. When TDS starts creeping above 50, your pre-filters or RO membrane may be due for replacement. iSpring also recommends following the time-based schedule regardless of TDS readings.