Referral Program Incentivizing YOU to Spread the Word About Water Testing. How It Works Refer to three other doctors. If they test, you’ll get free testing for one-year Name(Required) First Last Email(Required) Enter Email Confirm Email Referral Doctors(Required)Doctor 1Doctor 2Doctor 3 Add RemoveReferral Doctors(Required)Doctor 1 EmailDoctor 2 EmailDoctor 3 Email Add Remove