How big is the role of the water purifier? The front water purifier is the first layer of protection and the most basic filtration, unless the quality of the municipal water can be guaranteed is very good, but the kind is basically impossible in China. the installation of the front water purifier has a long life and high cost performance. It can protect and extend the life of PP cotton or other first-class filter elements of the terminal water purifier. The better pre-filter water purifier will basically filter out the water quality much better. for example, the type of pre-filter with the Ryder West level can basically put most of the water impurities (such as rust, aquatic animals and plants, residue, etc.) is filtered out in the first line of defense, which is the first barrier protection for domestic water. It is also the most important one. That woman.
Urgent: the high performance liquid chromatography solvent filter is blocked by the water phase filter when filtering Methanol. how to solve it? As shown in Figure 1, the high-performance liquid chromatography is composed of a solution Reservoir, a high-pressure pump, a sample feeding system, a chromatography separation column, and a vacuum filter to filter both particles and remove bubbles, very (2) the composition of the solvent should be gradually changed, especially to buy one again, or there is another way. Soak with acetone or alcohol, usually soak the water filter membrane in an hour, blow it several times in reverse phase, replace it or soak it for a long time, and blow it several times after soaking, it's almost the same to repeat it a few times. when the solvent is still clarified after soaking with acetone or alcohol, it proves that it is almost the same. Note this kind of thing, the bubble is not clean and hurts the column. The filter membrane also has a dual-purpose organic system of water system