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Interested to know if anyone has a Seneye (http://www.seneye.com/), what they think of it. Among other things, it is a PAR meter, which seems good for costing less than $200. I think I'm going to order one.
No, it's sediment, then carbon, then ro, then DI.
Sediment prevents carbon from clogging, carbon prevents chlorine from killing ro membrane, membrane does the real filtering, DI catches whatever is left over.
You don't count that as high alk? Calc reactors are good at maintaining things, water change would be faster/better way to bring tank within your target, then keep it there with the reactor.