Does a water filter remove lead? This is a question of great concern to many water health seekers. Most water appliance salespeople claim that their water filters remove all harmful substances, but this is not the case. From the current technology point of view, there are several technologies for household water filters suitable for removing heavy metals including lead, one is activated carbon adsorption, the other is KDF (copper-zinc alloy) electrochemical reaction, and the third is RO reverse osmosis membrane filtration.Therefore water filters definitely can remove lead from water.What we need to know is which water filters remove lead and what type of water filter removes lead?
What type of which water filter removes lead?
Which water filters remove lead depends on the composition of the water filter. Generally, there is only filtration (there are two groups of filter buckets for coarse filtration and fine filtration) and water filters adsorbed by activated carbon, which can only remove solid particles in the water and adsorb excess water from tap water. Chlorine, which cannot convert hard water into soft water, cannot remove lead ions from the water. Here are three basic water filters that can remove lead.
1.Reverse osmosis for lead removal---Does reverse osmosis remove lead?
What type of water filter removes lead is determined by the filtration pore size of the membrane. The filtration pore size of the ultrafiltration membrane is generally 0.01 microns, and the diameter of lead ions is 0.28 nanometers, which can completely pass through the pore size of the ultrafiltration membrane, so the ultrafiltration membrane cannot filter out lead. The filtration pore size of the RO membrane is 0.0001 micron or 0.1 nanometer, so reverse osmosis can remove most of the heavy metal ions including lead. Reverse osmosis system is widely used in the desalination of seawater and brackish water, and its proportion in household water filters is increasing year by year.
2.Activated carbon for lead removal---Does activated carbon remove lead?
Water filters containing activated carbon can remove lead from water, and the adsorption of activated carbon can remove some heavy metals (mercury, silver, cadmium, chromium, lead, nickel, etc.) in water. After the adsorption of heavy metals, backwashing must be carried out under certain pressure and temperature, but after multiple backwashing, the effect of activated carbon will be greatly reduced, so the removal effect of activated carbon on heavy metal ions is limited. The removal rate has a lot to do with the quality of activated carbon. Activated carbon includes coal-based carbon, fruit shell activated carbon, bamboo charcoal, etc. The best is coconut shell-activated carbon. Different types of activated carbon filters also vary widely in price, so it is best to choose a product from a reliable brand.
3. KDF for lead removal
KDF can remove lead from water through displacement reactions and physical and chemical adsorption reactions. KDF is a high-purity copper/zinc alloy particle that works in water treatment through a micro-electrochemical oxidation-reduction reaction (Redox), where the two metals in the alloy are on a submicroscopic scale when in contact with water Constituting countless small galvanic battery systems, this material has strong reactivity and extremely fast reaction speed in the water and can remove up to 99% of chlorine and dissolved metal ions and compounds such as lead, mercury, nickel, and chromium in water. However, it should be reminded that this electrochemical reaction of treated water will lead to excessive copper and zinc ions in the treated water, and it has been banned from being used in the field of drinking water treatment in Japan.
Among these 3 water filters, RO reverse osmosis water filter is currently the most ideal water filter for lead removal, belonging to the middle and high-end water filters.
How do water filters remove lead?
A more practical approach is to use a suitable water filtration system. The first step is to conduct proper water testing in a qualified laboratory. If you want to know what's in your water and how much lead is in it, you can go to your state's Environmental Protection Agency and get it tested. Some state or local health departments also offer free water test kits. Tests typically cost $20 to $100.
It is important to note that lead filters do not test at more than 150ppb, so if your lead contamination exceeds that level, or if you have a lot of other contaminants, you may consider using a reverse osmosis filtration system. To be certified to the NSF standard, a filter or water filtration system must demonstrate that it can reduce lead levels from 15/10 PPB or less.
Then consult a filtering expert to design a system that fits your needs and budget. The simplest and very cost-effective solution is to install a reverse osmosis unit under a sink with a separate outlet for drinking and cooking. It is important to note that some products will claim to have been tested to NSF standards. In fact, NSF International does not have the organization's certification and does not review such products.
In summary, due to the frequent occurrence of lead exceeding the standard, removing lead has become an essential effect of water filters. We all know that the use of water filters can remove heavy metals from water, so do water filters remove lead from water? The answer is yes, but not all water filters can effectively remove lead from water. At present, the water filters with the best lead removal effect are water filters with high-purity copper-zinc alloy (KDF) filter elements and Reverse osmosis water filters.