Review on Whatman 1004 070 Quantitative Circles Diameter by Russ Charmin

They are very suitable for fine filtration and used for cold brew coffee. By the way, anyone who talks about buying low-ash filters for a lot of money usually has no idea what they are talking about. Low ash filters are used when analysis of the collected filtrate requires burning the sample to determine what you have collected. A low ash content does not mean that there is less ash in the filter to "contaminate” or otherwise affect the solution flowing through the filter, but that the fibers used to make it produce practically no ash during combustion, so they do not affect the filtrate Analysis. None of them contain ash until you burn them as part of a chemical analysis. Anyone using low ash filters to create a solution rather than analyzing the combustion of entrained particulates does not understand what the various filters are for.