0
votes
2answers
19 views

Do polyphosphates reduce scale in refrigerator ice makers?

I am considering switching to a polyphosphate-containing water filter for my refrigerator ice maker/water dispenser. Currently, I use softened water to prevent calcium build-up in the ice ...
7
votes
1answer
1k views

When to replace respirator filters?

I've got a respirator like this one: I assume with the particulate filters (for dust) you just change them when they get hard to breathe through, but what about the organic vapor or chemical ...