Important instructions when changing sand : 1) Empty used sand. 2) Replace it with Marco Filtration Sand at the desired level. 3) Perform a backwash before restarting the system in «Filtration» mode.
After the new sand is in place (applicable for all brands of sand), it is essential to perform a backwash for a few minutes until water runs clear. Then, you will be able to turn the filtration system on again. If the water is still not running clear after several minutes, check the proper functioning of the pool filter.