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iSpring RCC7 vs Express Water ROALK Water Filtration System
The iSpring RCC7 hasn't managed to perform well enough to earn a place in any Under Sink Water Filter roundups conducted by sources that do their own, high-quality, hands-on testing. That alone makes it a hard product to recommend.
As for the Express Water ROALK-10DCG 100GPD - it wasn't considered to be a good enough purchase to earn a spot in any roundups conducted by sources that perform objective hands-on testing, which typically indicates that a product isn't worth its asking price.
As a last step, we wanted to do a head-to-head iSpring RCC7 vs. Express Water ROALK-10DCG 100GPD comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.