Home air purifiers with HEPA filters tend to have the highest CADR ratings, between 240 and 180. Those with a 179 to 120 are also suitable. If the rating is lower than 60 for any of the tested particles, the ma
Traditionally, people boil the water before using it for consumption. It is still considered as one of the most effective ways to filter impure water but it is not entirely practical. Though boiling water may remove certain germs and pollutants, it can’t eliminate all the impurities. So, ...
Watercanberidofgermsbyboiling.Theexacttimerequiredtoaccomplishthis dependsonaltitude,thenatureofimpurityandseveralotherfactors.Asafe generalruleisatleast10minutes,longerisbynomeansawasteexceptforfuel anditcausesthewater itself to evaporate. If there is reasonable doubt water is contaminated, don't take cha...