Types of Swimming Pools
{"Image DocumentName": "Types of Swimming Pools", "Image ImageDescription": "Alum (Aluminum Sulphate): A pressure sand filter can not be operated. without using a coagulant; the coagulant of. choice being alum. Other alum compounds. such as ammonium aluminum sulphate may. be used provided that there is chemical. supervision, because these compounds are. complex in themselves and may add to the. Water treatment problem.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}