Hi Again,

No, I'm afraid I don't know what ph level you should set your water filter at. Perhaps you can contact the distributor? I am sure there will be various website that can provide this info....
I just know that Ph exists on a scale of 0-14. Anything below 7 is considered acidic, and anything above is alkaline. For optimum wellbeing the Ph level in your body should be slightly alkaline, between 7.35-7.45. Symptoms and disease will ensue if this balance is not met, and all degenerative diseases (cancer, arthritis, endometriosis, candida etc) require an acidic environment to thrive.
There are also tests you can buy off the net to test your ph levels via the saliva in your mouth. This is a good way to check for improvement.
With the Zeolite - just make sure you go for the Original Liquid Zeolite known as Natural Cellular Defense, by Waiora. It is the original and has been tested for safety and efficacy, and is registered with the TGA and is recognised as safe by the FDA.

Hope this helps!!

XX