Cheap RO Membrane Cartridges?

[radiata]

Has anyone ever tried the no-name RO Membrane Cartridges on Amazon? If so, what are your recommendations?
They're half the price of the DOW equivalents, and sure look like a DOW manufactured white-label product.

https://www.amazon.com/s?k=CFS+%E2%80%93+1+Pack+Replacement+Membrane+Compatible+with+Filmtec+TW30-1812&i=garden&crid=1FOBEGZVFC3AR&sprefix=cfs+1+pack+replacement+membrane+compatible+with+filmtec+tw30-1812%2Cgarden%2C153&ref=nb_sb_noss

FWIW, I just picked up two of them for my tricked-out RO/DI unit.

 

[redfishbluefish]

Bob, check out my post on R2R HERE , where I talk about buying a Dow membrane from Amazon, and a CFS labeled membrane shows up that has a Dow label. Unfortunately I paid Dow prices while I could have purchased a CFS membrane at half the cost. And FYI, the CFS membrane with Dow label is performing just fine.