Frontier 370 P2 yellow color keeps turning into a mustard color.

[peterr]

Hi all. I am having issues keeping my P2 healthy 

A few months ago, i did a fresh chemistry mix for P2

Today i noticed that the color yellow on the upkeep is of mustard color 

What i have done is, i have increase the replenisher rate to 160ml/m2

p2 temp is at 38.0

p2 pump is circulating the chemistry

i measured pump output and input the readings.

the white on my paper has a ivory color hint to it. 

i also did a pump output measurement to make sure the bellows pumps are working, and they are working.

I also noticed that when i remove the p2 filter from its housing  i notice that the color of the chemistry is clear and not dark red as it should be.

I did fresh chemistry for p2 using the replenisher box but i believe it's not the chemistry because after fresh mix, the color looks great

The circulation pump is working.

any help i will highly appreciate it and thank you in advance.