This is the link:
Did you use an O-ring?
Can measure precisely your device to see if the o-ring is in contact with its counterpart? depending on your pipe thread, you may need to add a milimeter to the 3d part.
Hi,
Thanks.
Yes, i need to remove it from the pipe… but i probably need to replace them… when i made the opening in the pipe i mess with the interior borders… I used a 20cm hole saw to open the hole,… so probably the o-ring is not making the correct selling, i had assumed that the printed parts would stop the water… 
I’m learning in the process 
Hello,
I have also decided to buy a Ph-W218 based on these posts.
Unfortunately I have a problem with the integration, I can no longer get the local key via the dev. platform and the Tuya app only shows the temperature.
The problem is also known.
https://github.com/home-assistant/core/issues/94318
Can anyone help me?
There is a python script called “tint tuya”. You can use it to easily get all required info. You don’t need tuya cloud anymore
Hello, I read that you installed this Tuya equipment in 2018. So quite significant amount of time in service !
Could you share your conclusions/recommendations about this approach/solution ? What’s the reliability and accuracy of these equipments ? Frequency of recalibrations ? Etc…
Many thanks,
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hi, when i drill the pipe i damage the counterpart in the pipe thread, that’s why the o-ring doesn’t work…
i found a different solution adapting a male to male union reduction 1 to 3/4, i had to drill inside with a 20mm to fit the probes in the 3/4 part, then using a o-ring in the probes to fit them.
final result:
Also the device is reading better values for the ORP, 750mV, manually measuring the chlorine level it looks ok, and i didn’t calibrate it… i can’t understand why is working now…
Thanks again for the help.
hi,
just an update about my setup, i had a small issue about it… leaving the probes only with the o-ring could leave to problems… one of the probes “jump” because of the pressure (small flood )… i add to put something to lock them up… finally i got it:
How is this going now? Is it working accurately enough to recommend?
Not too bad, but I didn’t have time to fully test it and make it reliable.
Initially, I placed it in the electrolyzer cell, which is at the highest point in the system. Due to some sealing issues, the probe was often exposed to air for extended periods. I assume this caused my initial measurement issues.
Now, my probe is connected just after the filter, in a spot where air cannot get trapped in the pipe. The measurements are much more stable and accurate.
However, I haven’t done the calibration yet, so I’m not completely sure if the values are accurate. Regardless, my water quality was fine.
The values change significantly when the pump stops, and the probe is left in stagnant water. To handle this, I’m only recording data when the pump is on, with an initial delay.
I’ll spend a bit more time on it next summer.
I see the same results, the values look ok, measuring the ph and chlorine manual i get the same results.
I too have been working on HA Pool Management using Atlas Scientific probes. pH was the easiest to control with an automated peristatic pump. You are right that a helper is needed to delay reading the probe values after pump start up, I wait 10 minutes.
I have been chasing ORP/Chlorine values a lot and dialing in my SWG (Pentair I40) % feed. If you run the pump continuously with SWG off and maintain pH, ORP does not shift a whole lot. Your image looks like you run your pump for a few hours per day which gives you those peaks and values, try running 72 hours, no rain, maintain pH and it levels out fairly well. The chart below shows a dramatic drop in ORP when it started to rain, to which my SWG starts increasing production below 740 mv ORP. The problem is the rain caused the ORP sensor to think there was less ORP than there really is. I just plugged in my helper to disable SWG if my rain sensor (OpenSprinkler Water Level% < 5% = RAINING) but it only updates every 24 hours. I think I can figure out how to stop reading for 24 hrs since last rainfall using OpenWeather.
Just figured out Hours since last rainfall using ChatGPT. I queried ‘using homeassistant create a helper that calculates how many hours since last rainfall using openweather’.
Then I only allow SWG generator to turn on if its been over 24 hours since last rainfall