After the processes of cutting, grinding and polishing are complete, each lens is cleaned with very pure water. De-ionised (DI) water is used for this purpose, as it attracts surface contaminants to it and leaves a spot free finish ready for the tinting and coating processes to be applied. The lenses are often racked and dipped in the agitated DI water in small batches so not much water is required.
The low volume of water required means that source water can be fed directly through the DI resin, to remove all salts and ions, and then through filtration stages for bacteria removal protected by a chemical and sediment removal cartridge. This water is kept running through a re-circulating loop to agitate and remove any debris in this continuous process.
Stages of Filtration & Water Treatment
Ions and Salts Removal
Very pure water is produced using reverse osmosis membranes to separate the majority of salts and ions from the feed water and sending the salts and ions to waste or re-circulation.
Chlorine and Organics Removal
Helps the taste and odour of the liquid and where present, protects RO membranes from chemical attack.
Reducing the levels of bacteria to log 7
SPECTRUM General Purpose DI Resin
The high quality mixed bed resin, SPECTRUM SRDI is designed to ensure the highest capacity and most efficient operation to create pure deionised water.
SPECTRUM 870 Economic Carbon Block Cartridge
SPECTRUM Economic carbon cartridge removes chlorine, chemical and organic taste as well as odour and appearance removal. Great for pre-filter in applications such as RO.
SPECTRUM Premier Pleat Polyethersulfone
Bacteria retention rates in excess of log 7 establish the SPECTRUM PPPES range of cartridges as the right choice for final guard filtration in a host of pure water applications.