Nitrates in my source water

[Piper27]

So suddenly I have been having issues with nitrates creaping up. I haven't changed anything on my rodi unit which has been working for years. All filters were good and I even changed out the prefilters. Still getting about 4ppm nitrates per salifert kit. I am wondering if somehow I am getting chloramines which hampered my ro filter but it's new too and still getting 3tds after the ro unit. Other than that I have no clue why I would be getting any reading at all. Anyone have any ideas? It's defiantly coming straight out of my rodi unit. I am also afraid phosphates are coming out too but don't have a test kit for it on me. I will have to check everything again tomorrow since I changed all prefilters. I did check right after I changed them though.

I have seen a color shift on a few acropora which worried me so I checked things and found my rodi top off tank had white bubble bacteria growth at the top of the water. This is when I checked my source water. I had two acros rtn in the matter of hours which looked like a bacteria infecting just ripped through them. Others look ok for now.

 

[Piper27]

This is what my top off water looked like.

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[Maivortex]

Are u on well water

 

[Piper27]

Nope city water, hence why I was thinking chloramines but the ro filter seems to be working fine along with everything else. Di resin is lasting as long as it normally does.