Cartos can be refilled quite few times. You'll get various opinions from "just a few" to "hundreds". In any case, you can refill them a reasonable amount of times if you take care when cleaning them. Here's some info on cleaning and refilling cartos:
YouTube - Care and Feeding of Cartomizers Part 1
YouTube - Care And Feeding of Cartomizers Part 2
Also, you'll see some saying DO NOT BOIL CARTOS so if you wanna clean another way:
YouTube - KR808D-1 Carto Cleaning: Quick-n-Easy.
As far as getting new cartos to fill, I think it's the best way to insure flavor and functionality but don't overlook cleaning and refills. That works well too if...like I said...you do it properly. I do both.
Oh...and you do not disasseble the carto. Just clean it. Hope that helps!
YouTube - Care and Feeding of Cartomizers Part 1
YouTube - Care And Feeding of Cartomizers Part 2
Also, you'll see some saying DO NOT BOIL CARTOS so if you wanna clean another way:
YouTube - KR808D-1 Carto Cleaning: Quick-n-Easy.
As far as getting new cartos to fill, I think it's the best way to insure flavor and functionality but don't overlook cleaning and refills. That works well too if...like I said...you do it properly. I do both.
Oh...and you do not disasseble the carto. Just clean it. Hope that helps!