1, ion exchange, in general water treatment equipment, the lowest price, the regeneration of the resin, the use of high cost and maintenance costs.
2, reverse osmosis equipment, in ordinary water treatment equipment, the price of mid-range, late maintenance only 8 months cleaning once, we use Dow RO membrane, membrane life in 3-5 years (well-maintained as a prerequisite), usually two years to replace once.
3, reverse osmosis + mixed bed, in the ultrapure water equipment, low price, but the late still the same as the ion exchange equipment, the need for regeneration, the use and maintenance costs are relatively inexpensive compared to the ion exchange equipment (because of the use of reverse osmosis equipment before the mixed bed, so the water quality after the mixed bed will be more stable than the water quality of the water, so the mixed bed will be used for a longer period of time, of course, the maintenance costs will decline).
4, reverse osmosis + EDI, in the ultra-pure water equipment, high prices, 1T reverse osmosis + mixed bed and 1T reverse osmosis + EDI price difference can reach 3 times, so the highest acquisition cost, but because the EDI equipment is used in the way of ion removal, so it is the most environmentally friendly, maintenance costs and the use of the lowest cost, while the water quality is also the most accurate, penny wise and pound foolish.