There is a revolving rake to scrape settled grit to a sump for removal. The heavy material settles to the bottom and is then dragged upwards by means of a rake, and then discharged. A rake is a device used in thickeners and settlers to move the settled solids toward the place where they leave the vessel.
The average costs of deep cleaning is between $100-to-$400 per quadrant. This means that if you are getting all four areas scaled and planed, it can cost you as little as $400 or as much as $1,600. About how much you will pay depends on where you live.
Scaling and Root Planing Costs. A regular dental prophylaxis (professional teeth cleaning) averages between $30 and $75, (check all fees  in general these may be low) while the cost of periodontal scaling and root planing averages between $140 and $210.ith periodontal diseases, the sulcus widens, creating a deeper pocket of more than 3 mm, resulting in harmful plaque buildup that cannot be cleaned without professional dental treatment. Scaling and root planing is performed when pockets are greater than 3 mm.