Choice if filter for filtering solution of different salts from contaminants?

18 August 2020 1 9K Report

When I run a solution containing dissolved salts of Mg, Ca,, and Na and as well sodium bicarbonate through a Nylon based 1um filter, I noticed that pH increases.

I am concerned that some salts are removed. Do Nylon based filters do remove some ions or it could be only that H+ ions stick to te Nylon membrane?

Ron Reiserer

Hey Ilija, I hope you are doing well these days.

Nylon has a tendency to absorb quite a bit of water. Roughly 10% by weight is not uncommon. If the volumes you are filtering are fairly small, then you are likely to see some effect on your solution as a result of the loss of water into the nylon.

You may want to switch to a PTFE filter.

Best regards,

Ron

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