WYBOT C1P Pool Vacuum WYBOT C2 Pool Vacuum (New) WYBOT OS700 Robotic WYBOT S2 Pool Vacuum WYBOT A1 Pool Vacuum Why does water appear inside the product packaging? Each unit undergoes meticulous underwater testing before packaging to ensure optimal performance upon delivery. Minor dampness or water stains on the machine are considered normal. Why can't the machine climb smooth walls? Please Install the included floating kit in the machine for climbing on walls of any pool material. Are there any simple tricks to improve the filtration efficiency? Some of creative customers have shared a handy tip: placing a layer of cheesecloth (or a fine mesh cloth) over the inside of the filter basket. This can help trap even finer particles like microscopic algae or silt.