make sure hes not drinking Fluoride water and go for bottled or purified water. Take the following supplements known for sperm raising:-
ZINC 25mg twice daily 50 mg
SELENIUM 100mcg twice daily 200 mcg
FOLIC ACID 200mcg twice daily 400 mcg
VITAMIN E 200IU twice daily 400 iu
Follow the above EVERYDAY and get his levels checked after a month, that is if you dont become pregnant before haha. I would suggest using Ozone, Colloidal Silver & Terminator II zapping at some point in the future especially if the above doesn't work. I know alot of people with low fertility have rocketed just on Zinc and Folic acid.