Kinetico 4040S od or model 60?

[Safecracker]

I have to revamp my water filtration system and I had a chance to pick up a used Kinetico system so that I would add this to my existing system. One model is a 4040S OD and the other is a model 60 T. I would install either one of these after my original system so that I would have double clean water or maybe double trouble. Both Kinetico systems are used about 4-5 years old and will most likely need new media.
Which system would be best for me?
Where do I buy new media and what kind should I buy?
My hardness is 16, Iron is 1 , TDS- 42 and I have sulpher and light tannins. My well is deep about 100 feet and I live in Florida.
Thank you

[Gary Slusser]

What is you original system?

What is your water analysis data?

How many people and bathrooms in the house and any large tubs or 2 person showers or body sprays?

Why an OD model?

[Safecracker]

I nixed those plans due to all the information I read here. I won't be buying a Kinetico.
I think the OD stands for Overdrive but I am not sure.
Thanks for the reply.