28,000 Ga / IG / DiamondBrite plaster / SWC

Yard guy dropped what I think was fertilzer into the pool near adjacent flower beds resulting in what look like rust stains (likely from the iron in the fertilizer). A few days later I note that FC has dropped from usual around 6 to near zero. No algae yet but I know I need to move on this. Currently:

ph 7.2, FC 0, TA 70, Ca hardness 200, Na 3000 ppm / CYA 40 / Temp 86

Phosphate 2500 ppb (I suspect that this is from fertilizer).

I have already shocked with bleach and will do so nightly until this is all addressed. Have turned SWC up to 100% and have added a small amount of CYA. Will add baking soda tomorrow night to bring up TA.

What do I do next? PHOSfloc? PHOSfree? Something else?

Thanks to any and all that can help me.

Slam Pool Guy