When high-efficiency (HE) laundry washers were introduced a few years back, many consumers suddenly began paying more attention to the laundry soap they were buying. High efficiency machine manufacturers warned that using “regular” laundry soap rather than an “HE detergent” could void the machine’s warranty.

So what about a water softener system? Does it matter what type of soap is used after a water softener or conditioner is installed?
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