He sent me one to try that lasted about 6 months. SSS lasted about a month. I went from buying 36 SSS a year at anywhere from 40 to 75 apiece to 12 of Bob's at 25 apiece. I have 6 machines and go thru about 5 drums of bleach a week so roughly 55 gallons of bleach a week for 6 months, so 330 gallons of bleach cut three to one= 1,000 gallons of chems thru the injector in it life span. That is good to me. Then it is just a matter of replacing the barb from the new injector and putting it on the old one. Not knocking Espec, and I love Paul, but the prices never stayed the same and the S/H have gone back to the old ways. I just bought two small balves for $53.32 and paid $22.84 for S/H. Drives me crazy.