PH drop

DWC 5 gallon buckets, week 8-9 of flower. Girls look great but I am dealing with a PH drop. In the past 3 weeks, everything was stable, 2 weeks before that had PH rise problems. Added tap water to bring it up but it drops back down to 5.5-5.4 in 48 hours. I am worried I have come this far and the final 3 weeks will be ruin a nice looking crop. Temps are good in the water 62-64, ppm is 1000, using ROCK bloom and resignator at about 300ppm under recommended (always read not to go full strength label). I read about ph perfect but have no experience. Any advice?

First I am not a grow guru. They are around here but do not mistake me for one LOL. Just keep pHing your reservoir. You don't have long to go and as long as you keep yourself in range you are golden. So if you see this swing q 48h then pH q 24 or less. Just get this over successfully. I wouldn't worry to much. Hopefully the grow gods will be along with their flashlights soon

I'm not using a reservoir system. Isolated bucket system, 30 pods, 2 set ups, on large pump to keep problems contained. I figured it isn't long to go so ill just hang on and see now this plays out. Thanks for the advice.

I've noticed violent pH swings when my nutrient got bacteria or other slime organisms. Honorable disclaimer: my grow experience trails c2g's. cn