Reservoir color change - what does it tell you

Hi, I was wondering if there is any information on using your res color to determine generally which nutes your plants are taking in. I am using the GH Flora Series for example, and my solution has turned yellow-ish after a week (2 gal non-recirculating bucket). In the past it has turned completely clear. Can we use this information in any useful way? I assume it varies based on nite supplier. Flora series is micro(maroon)/gro(green)/bloom(pink).
If not, is there any other way (cheap/diy if possible) to determine what is actually being used?

No.... And yellow doesn't seem good. Do a res change. The best thing you can do is use a TDS/PPM Meter to see a total decrease in nutes. The only way to see exact micro nutrients individually, would be a meter you and most of us definitely can't afford, nor would we need to.
GH Flora Trio + CaliMagic is foolproof.

A small 2 gallon capacity system should be changed out often, like every couple days.

Also, the GH nutrients use a food coloring to get those colors, it's not the actual minerals causing the color. Therefore we can't use that as a means of judging whats been consumed and what has not.

If you really wanna get into the analysis of the used nutrients then it's gonna be expensive.

Renfro said:

Also, the GH nutrients use a food coloring to get those colors, it's not the actual minerals causing the color. Therefore we can't use that as a means of judging whats been consumed and what has not.

If you really wanna get into the analysis of the used nutrients then it's gonna be expensive.

Multiparameter Benchtop Photometer and pH er and pH meter - HI83300

The Hanna Instruments HI83300 is a compact, multiparameter photometer with digital pH electrode input.

www.hannainst.com

Click to expand...

Thats a slick looking unit. Do you use one yourself?