Thats crazy high. lol
Just remember that you will go through di resin a little quicker than other people most likely. For instance, I have about 250 tds going in and I get to 0 with my 5 stage. The di resin lasts me about 5 months usually and I make a ton of water. I also flush my membranes before every use for like 5-10 minutes so that the tds going into the di resin cartridge is like 7 so the resin holds up very well.