Does it pick up sand on the bottom too?

Thanks for your interest in our cordless robotic pool cleaner Scuba L1 with a one-year warranty. It comes with a dual filtration. The primary filter with a mesh size of 180 microns is specifically designed to clean visible particles, effectively filtering out common debris and stains found in most pools. The ultra-fine filter has a pore size of 3 microns and is designed to target invisible particles, effectively filtering out common green algae and microorganisms. Therefore, please note that sand with a particle size less than 3 microns may slightly flow back into the pool. Many thanks for your understanding in this matter. Should you need any other assistance, please feel free to contact our customer support via email at service@aiper.com. We are always ready to help.