If your drain keeps slowing down every few months no matter how many times it gets snaked, you're not imagining it, and nobody's ripping you off. A snake punches a hole through the clog and water flows again. But the years of grease, soap, and buildup coating the pipe walls never left, and in La Mesa's older neighborhoods, where a lot of drains have been collecting buildup for decades, that coating catches everything that comes through. The hole the snake made closes right back up.
Hydro jetting works differently. Instead of drilling through the mess, a high pressure stream of water washes the pipe walls down, all the way around, top to bottom, and the buildup gets carried out of the line entirely.
Is jetting always the answer? No. Some clogs are one time events and a snake handles them fine. The contractor looks at what's happening in your line, explains what they see, and makes a recommendation. You make the decision.