You only need to set-up the pump at volume you want and take a measure, pumping simply tap water, of how much water it pumps in a minute. Afterwards you can control how much time the pump is running to feed the chloryne you need to the pool. Mine for exmaple is set to pump 300cc per minute and i push 1.2litres of chlorine therefore i make the pump to run 4 minutes.
Make sense ?
Thank you, testing with wter is a good idea.
Thanks for this, I orderded a variation of your tube. How did you seal the temperature probe?
In AliExpress you can find lot of different rubber seals. I used a rubber seal I had at handy from ip68 junction boxes that I normally use in the garden. Self fusing silicon tape is also an option.
This is probably the best choice
Great, thanks! just got the tube, the HW218 and the new probes. Also bought a new inverter pump. Pool is now in the winter setup, but come spring I’ll be busy putting everything together.
Hi Yuanca, after spending my summer setting up my system, I stumbled on your post! I have the same chemical tester which has worked great for 3 years now, and wanted to replace the pH and ORP probes this year. It looks like I ordered the same as yours on the picture, and the ORP works great for me, but I can’t get the pH probe to read (value does not change). Did you need an adapter or modify anything in the tester itself for yours to work?
Also would love a link to where you got the saddles from. I 3d printed mine and after a huge amount of filament for print troubleshooting and a crazy collection of washers to find the right fitting, it is sort of ok but I have a feeling it won’t last more than 1 season, so I’d like to replace them for next year.
Hi N3rd7,
• I replaced the original pH probe twice: it worked fine for only a couple of days and then started giving inconsistent readings. That’s why I ended up buying these probes on AliExpress.
• At first I did everything with 3D printing, but every time I had to check or remove the probe the printed adapter would break. So I decided to buy the adapters I mentioned in the post I made on the forum in July 2025.
• I bought the collars from the link posted by Reunion974 in September 2024.
Regards,
Juan Carlos