TESTING AND MEASURING APPARATUS, NAMELY, WATER TREATMENT, FILTERING, AND PURIFICATION UNITS FOR USE IN TESTING WATER PURIFICATION, WATER CLARIFICATION, WATER SOFTENING, WATER STERILIZATION, WATER DESALINIZATION AND WATER DEMINERALIZATION; REPLACEMENT PARTS THEREFOR

WATER TREATMENT APPARATUS, NAMELY, WATER FILTERING UNITS FOR LABORATORY, MEDICAL, COMMERCIAL AND INDUSTRIAL USES; WATER PURIFICATION UNITS, WATER CLARIFICATION UNITS, WATER SOFTENING UNITS, WATER STERILIZATION UNITS, WATER DESALINIZATION UNITS, AND WATER DEMINERALIZATION UNITS; REPLACEMENT PARTS THEREFOR

INSTALLATION, MAINTENANCE AND REPAIR OF WATER FILTERING UNITS, WATER PURIFICATION UNITS, WATER CLARIFICATION UNITS, WATER SOFTENING UNITS, WATER STERILIZATION UNITS, WATER DESALINIZATION UNITS AND WATER DEMINERALIZATION UNITS