With your volume pool (5000 gallons?) you need a proper test kit. I suggest the
TF-100 A proper test kit is needed to get the accurate water chemistry results needed to follow the TFP protocols.
I suggest you add 3 ppm FC worth of liquid chlorine each day until you get your test kit. That would be about 3 cups per day of 10%. You can get that at Walmart, Home Depot, Lowes, etc.
Once you get your test kit, post your results here and we can guide you further.