Yes RODI really helps with algae. Spectrapure and bulkreefsupply was my top 2 options. There was a guy on another forum saying that spectrapure was superior to BRS RODI. I ended up getting the BRS unit since their prices are great ($130 black friday sale) and many members on this forum use it.
I don't know how to link a thread lol but I know if you go to the search and type "BRS" you will see the current buy for after Christmas. All you do is create an account with them and then pm the thread starter (bavass) and give your email and last name and he will forward it to BRS and then they email you the day it starts. You don't even have to buy anything if you don't want to. It's a a win win.
one more vote for bulk reef supply. I have that exact same unit in the link above. You cant go wrong with that price, it has the pressure gauge on it, flush kit and tds meter. definitely a worthwhile investment