Do These Membranes Look Cracked?

[Joel M]

I bought my first RO this month, a used Deer Run 250. The guy I got it from had not used it in 2 years so after I got it home I gave it a good cleaning, flushed some water through it and decided to open the canisters and have a look at the membranes. The ends of them look very dirty, almost like mold, and there are multiple dark lines all over the sides. I am wondering if it looks like the previous owner let these freeze?

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[madmapler]

Probably best to get some new ones. They either froze or dried out over the 2 years if it just sat without a heated room. Either one is not good for the membranes. New 4" membranes aren't very expensive and you'll know what you have.