Mike, the requirement for a service contract (the system installation includes the first two year's warranty and service) is a state law. However, when I first inquired about them, a couple of dealer/installers told me there was no one to enforce that law, so you could ignore it if you wanted to. However, in Navarro County we have a county sanitarian who does enforce it. If you get a permit for installation, there is a form that he requires be filed in the courthouse with the deed to the property, and on that form, the property owner is agreeing to maintain a service contract. And then he keeps a file of the contracts and if a copy of the new one isn't forwarded when the old one expires, he sends you a letter asking where it is. And the service company has a form they fill out each time they inspect the system and they send me, and the county sanitarian, a copy each time.
But otherwise, you're right. I could do all the maintenance myself in about 20 minutes every 3 months./w3tcompact/icons/frown.gif It's just a visual inspection, clean the air filter on the air pump, wash the filter in the treatment tank, and check the chlorine in the final tank.
Bird