Look at these PPM levels

[SHRED]

This is my tap water. Yikes!

My RO water tests at zero.

 

[Bob's Auto's]

Calibrate your pen first. Then measure

 

[SHRED]

Calibrate your pen first. Then measure

I left the cap on. DOH!

Here's the accurate read.

 

[Bob's Auto's]

I left the cap on. DOH!

Here's the accurate read.

View attachment 1467801

That's still very hard water you have... Do you have a sheet from your water municipal?
Ánd, did you calibrate the pen?

 

[SHRED]

That's still very hard water you have... Do you have a sheet from your water municipal?
Ánd, did you calibrate the pen?

I'm in San Diego county.
It's notoriously hard water here.