PH water issues

Hi, Our PH reading fluctiuates and will not hold steady and will not come up when using PH up after nutrients are added. There is also white milkt substance in the body of the tray. Does any one have any ideaas?

Couple of q's. What system are you using? i'm assuming its hydro. And what is the ph of ur water before adding nutes or PH solution? Tap water is normally too high in most areas, so im not sure why you have a need to use ph up. Just sounds like you need to clean out your reservoir, and make sure you don't use to much ph up and down as its bad for your plants and can cause the ph to become unstable. If you do use too much ph adjuster its best to throw it out and use some fresh water. Good Luck, Gats