We use DI in the shop for its quickness. Works great as long as you keep an eye on your TDS meter so you know when to swap a cartridge. I have to reasearch into recharging DI's but I hear it's easy.
I use RO/DI on my home system because speed isn't a concern and it's cheaper, IMO. RO lasts 2-3 years(depending on usage ect?) and I haven't replaced my DI in well-over a year.
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