I couldnt find where he said he was adding chemicals to the water. Maybe I missed it? Im going to have to disagree with your first sentence. (Not trying to stir the pot :wavehand: ) absolute 0 nitrates are impossible to obtain unless you are diligently persuing a ULNS with apropriate carbon dosing and aggressive skimming, which should only be attempted by the most skilled reefers IMHO. Low readings of nitrates is fine and can actually be beneficial in the health and beauty of corals. Phosphates are very hard to remove and are probably the #1 cause of neusence algae. Runing phosphate media or macro algae is the best way to recover from high phosphates.
You say you are adding distilled water, thats better than tap water but not even close to the quality of reverse osmosis, de-ionized filtration (RO/DI) Your goal is to achieve a 0 with a TDS meter (TDS = Total Desolved Solids) I would get a TDS meter http://www.bulkreefsupply.com/catalog/product/view/id/401/'Every serious reefer needs one of thes IMO. I would be curious to know the TDS of the distilled water youre using.
Looks like it was edited out somewhere. But he was mentioning adding a few chemicals into the tank.
And honestly, Ive never had nitrates. Ever.
Agree with using distilled. And there is also said that some water distilling plants use copper pipes during the process. Which is why I wouldnt use distilled water