Plumbing issue - how to proactively clean pipes to tank

[Steve S.]

I’ve had an issue with some toilets backing uo And showers not draining. I had the septic tanks (there are 2) drained. 

Last week we had another clog. I shoved a hose into the pipe coming from house to the tank and was able to alleviate the issue. 

However, while I have everything duh up and exposed, i figured it may be good to more thoroughly clean the pipes out for any crud stuck to the sides of the pvc 

Any suggestions?  I’ve seen a machine you can rent for like $450 plus $150 per hour. That sounds crazy expensive.