For chloramines, you really just need a quality carbon block. A carbon block specifically designed to handle chloramines is ideal, because chloramines tend to wear out regular carbon blocks rather quickly. If you have two carbon blocks, even better.
A five stage system will produce pure water no matter what the input, in almost all cases. In some cases, a different system with more or different stages might be ideal, but that depends on your water supply, both the pressure and dissolved solids. You can personalize and upgrade the system as time goes on. Over time, I've upgraded my system to have one prefilter, two carbon blocks, one membrane, and three DI stages (two single beds and a mixed bed). The 5 stage is a good place to start though. If it were my system, I would add at least another mixed bed DI resin, and a booster pump depending on source water pressure and TDS. But almost all reefers have sufficient pressure to run a single membrane without a booster pump.
Some reefers choose to get a two-membrane unit, but I'm not personally a huge fan of reject staging. I don't feel that the complexity and cost is worth it in terms of money saved on water bills. Plus, it's almost impossible to dial in waste to product ratio when running two membranes. But, to each his own.
Don't worry about it, they all look like that. Scare the heck out of you. Honestly, looks like a pretty good water source to me.
