Raspipool sends alert for frozen risk (water temp below 5 degrees or outside less than 0 °C for 24 hours)
When this, you can put valves closed and remove the probes and save them inside home with water in the factory cover.
My 6€ ph probe is 2 years old and is working like a charm. Orp are more delicated.
It is really much easier than you think (for me it was the first time I did it).
You only need the material (very cheap, less than 40€), a saw and glue (especially for PVC).
1. Connect the bypass with the collars from the filter outlet until before the pump. Build the bypass without glue, to see how it looks and adjust the perfect cutting measures.
2. The thick tube (50mm = D50, where the probes are) is horizontal and as low as possible, to ensure that it never runs out of water. And recomended less than 3 meters from where the raspberrypi is (for not cables too long).
3. Chop the pipes with a dremmel with a rounded fat sander head. Test first on an unused pipe (with the collar on). Finally, when you have practice and the holes are perfect, make them on the main pipes (what you need most guts).
Meanwhile I am writing and documenting the wiki of the project , I am thinking about the possibilities and upgrades of the system, and now I'm circling a possible improvement about sun times besides temperature, to control filtering time.
Currently, the system calcs the filtering cycle time in function of temperature of water inside the pool.
Now, I want to include an option for control SWCG instead of bleach injection, but for what I have seen here and around, the production of FC is usually lower than bleach injection, so maybe the time to filter could be determined more for chlorine creation needs than for temperature. As one of the great factor of loosing FC is the sun, and with Home Assistant we can easyly build a sensor of UV rays our pool is receiving, to estimate FC loosing and start filtration when needed. Once filter has started, we could use ORP meassurements (after one hour) to get more real needs of FC than only UV rays (bathers, wind, cover, etc.)
( so, when days cloudly, less filtering and less SWCG usage ).
Please, I need feedback about this idea, before develope it. Take into account I cant test it, because I dont have SWCG, and almost no FC loose because a permanent UVA cover.
I dont know..., maybe it could be good for work with a less CYA levels.