I got a walk-in tub. It's nasty; all the tubing is black and the water level goes down when you take a bath. The manual just touches on the fact that either filters or screens need to be kept clean, but never says where they are. Any insights? It's a 2015 SafeStepTub.
You can use a solution of water and powdered dishwasher detergent. Here is a great article: www.safesteptub.com/