Even though the kits are cheap(ish), why not get the store to do it if they are free? People like free. It's a known fact. Some of the tests are also labour intensive. I can totally see why people would have a store test their water. And for those people, so long as the store facilitates it (with free or cheaper test) they will keep coming for them. And why not? It gets people into the stores where they can talk reef and maybe walk out with some new fish food, a net, that impulse buy fish, new skimmer or that fancy new plasma lighting everyone has been talking about!
Having said that, I have never had a store test my water. I'm too lazy to drive there every time I want a test. Now if I could just get Denny to come to my house to do water tests..
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