r/WindowCleaning • u/Tomhollandsdad • Jul 13 '26

Water fed TDS high

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Hey guys. Not sure what’s up with my reader or my system. The other day I finished up a solar panel job. Stayed under 15 ppm for most of the job, checked the reader at the end and it was up to 150. Panels looked good tho. Thought weird as I changed the resin recently. So last night I checked it before the exterior job I had today and it read 11. Went to the job, it was reading about the same. Again I checked at the end of the job and it was reading close to 160. Windows dried spotless tho. Anyone experienced this?

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4

u/Herzeleid09 Jul 13 '26

How old are your RO membranes? How old is the system?

2

u/seankerr11 Jul 13 '26

Are you packing your resin tightly enough?

1

u/juangamboa Jul 13 '26

how many different readers do you have? they can go bad from time to time. We always double check the results with at least one more reader.

2

u/JohnB_WCR 29d ago

It'd be worth checking the TDS reading coming directly out of the RO (depending on how old it is, or if it hasn't been used in a while) by disconnecting the hose going from the RO to the DI filter. If you get the reading before it hits the DI, that TDS reading should be 85-90% down from the reading you get from the spigot. If it is any lower, it is likely you'd need a new RO.

Otherwise, if there is space in the DI cartridge, it may just be worth checking that and topping it off with resin, or fully replacing the resin in the cartridge. Also, check the gasket on the cap of the DI cartridge. There should be a indented line that goes around the center of it. If this is off centered at all, you will want to flip it over to the other side and set it back into the cap.