Foxman must apologise but yes Purolite resin is virgin, what does not help is when you have specs on the net stating the otherwise which can lead to confusion
http://www.derwentwatersystems.co.uk/mb400.htmlThere is a huge difference in perfomance though, and what I would advise people is not stick to the same constant resin but find out wich works best for them. You will them be surprised at the difference between them which I have found and others that there can be a difference of double the performance on some products. It is entirlely your choice what you use but for me money counts , so spending around £160 a year on one product compared to £400 is a huge saving for me.
Each company will have data sheets etc.. on performance which I have seen and was surprised at the difference. However sorry I cannot disclose this as I am bound not to, as this information can then get back to the manufacturers. The information is from a lab and once you start to undertsand the scientific data then you start to understand, don't ask me to explain it , took me a long time to understand.
In summary keep trying and you will find out which is best and value for money. Trust me you will be surprised and I am not stating that Tulsion is better than everything on the market as I have not tried all apart from Purolite and Rohm.
Cheers
Doug