delphinus - get in touch with the customer service at Spectrapure (ro/di filtration manufacturer) and tell them you have relatively high phosphates in your RO/DI water. They have a bunch of custom filters and DI resins for different types of water quality and they might be able to get you the correct selection of filters. I dont know if there is anything that will remove phosphates but you can give it a try.
EDIT~~~~ ok i found it.
this di resin should help kill some of your phosphates;
and i will even save you some money
- here is a link to their holiday special - think its $22 bucks.
http://www.spectrapure.com/email/cus...reciation.html