Boiling the water only has the effect of increasing mineral content. Minerals don't boil-- ok they do but not technically in the way water does. Boiling will kill bugs/bacteria/viruses in water but boiling the water will release pure water into the air, while the minerals remain behind, increasing the concentration of that water left in the pot. Imagine, if you will, the inside of your hot steam humidifier-- over time, it collects minerals which manifest themselves on the hotplate as that nearly-impossible-to-remove encrusted junk-- THAT is what you get if you keep boiling water.
DI is de-ionization and essentially removes the last stray ions of your water. Stray ions tend to bring along other things such as dissolved solids, Calcium, Sodium etc.. as well as heavy metals. Having a free ion out there that gets nabbed by the DI filter will keep the last remaining bits of bad stuff in your water from going into your clean-water-supply.
I got my RO/DI from Bulk Reef Supply-- an online vendor that caters to Marine Aquarium hobbiests (of which I am one) but their RO/DI units are fantastically built. I have zero affiliation with them but can assure you you'll have a wonderful experience buying from them. I got the 5 stage plus unit, which includes a monitor to know what the quality of your filtered water is-- which allows you to know when you need to get new filters. I don't use mine very often (my tank is not that big-- 55 gallons) but I'm so happy with its operation and Bulk Reef Supply has very good customer service. I paid roughly 180 for mine.
Hope this helps!
DI is de-ionization and essentially removes the last stray ions of your water. Stray ions tend to bring along other things such as dissolved solids, Calcium, Sodium etc.. as well as heavy metals. Having a free ion out there that gets nabbed by the DI filter will keep the last remaining bits of bad stuff in your water from going into your clean-water-supply.
I got my RO/DI from Bulk Reef Supply-- an online vendor that caters to Marine Aquarium hobbiests (of which I am one) but their RO/DI units are fantastically built. I have zero affiliation with them but can assure you you'll have a wonderful experience buying from them. I got the 5 stage plus unit, which includes a monitor to know what the quality of your filtered water is-- which allows you to know when you need to get new filters. I don't use mine very often (my tank is not that big-- 55 gallons) but I'm so happy with its operation and Bulk Reef Supply has very good customer service. I paid roughly 180 for mine.
Hope this helps!