Wow thanx guys. So do I have to call someone to replace the media? If so,how much would it cost and could I do it myself?
I have a roof, how long will it take? I need surgery, what are my chances? I have a water system, what will it cost to fix?
Sorry, but as we have mentioned before, it is absolutely impossible to recommend a solution (let alone costs) without knowing what you have, what needs to be done and how willing you are to do it. Do you have at least pictures of the system?
The tank after the softener is probably carbon as most pH tanks go before the softener---but there is no telling until more information is provided, and that may take dismantling the system and examining it.
Whether or not you can doit yourself depends on your aptitude for DIY projects. Some particular tools may be needed but all-in-all, most handyman types can rebed units.