Swimming pool pump flow rate monitor? Pool temperature sensor? (re: swimming pool automation)

Does anybody know of anything I can use to remotely monitor my swimming pool temperature?

Also, I’m not sure if this is even useful to know, but can I somehow monitor the pump flow rate to make sure water is flowing correctly without any blockages, etc?

Esp8266 plus temp probe

I’ve written up my approach measuring the water temperature a while ago: https://neon.ninja/2017/10/smarter-swimming-pool-2-water-temperature/

Re flow rate: I haven’t integrated a proper sensor into the plumbing, but as an approximation I’m monitoring the power draw of the pool pump with a smart switch: if the power draw is decreasing significantly that usually means that the water flow rate has decreased and I need to clean the filter.