To lower stool pH several things must take place. 1- Transit time must be 1 day.  Measure this by taking 1 tablespoon of liquid chlorophyl and see how long it takes for stool to turn green.  Slow transit time is improved by less time sitting and more time walking. 2-Fiber must be in the diet.  Consider 1 cup of bean per day and 1-2 capsules of Panaceum per meal. 3-The distal colon can’t be making ammonia.  This is indicated by very high pH.  Usually over 7.2.  To lower stool ammonia and pH, lower meat consumption (at least temporarily) and consider using Phylamet.  If 20mM does not help, consider up to 60mM, but if you get sore kidneys, that is too strong for you. 4- Low lactic acid. Consider using Lactimet, 5- Low SCFAs, consider supplementing with Bifidus.