What Are Included- 2 piece of 5 Micron Sediment Filter: With only five micron rating, it is effective in removing dirt, rust and sand particles. NSF certified. - 4 piece of 5 micron Carbon Block Filter: Remove any remaining chlorine and organic chemicals. Further enhance the taste of water. Note: this model, F7-CTO, is for customers who prefer to use CTO in both 2nd and 3rd. We have another model, F7-GAC, which uses GAC in 2nd stage and CTO in 3rd stage. Stage 5 - 1 piece of Post Carbon Inline filter: This carbon post filter removes objectionable tastes and odors to enhance the quality of your drinking waterpatible to most RO systems that use 10"x2.5" filters. Why Purchase From us- Honest seller, more than 1500 positive feedbacks on eBay - Free tech support before and after sale We also carry many other water filter systems. Please check our Amazon store.