Just come to do an ano run after about 3-4 weeks of no use although I have periodically turned the pumps on the circulate dyes etc I have a small problem.

Ran some parts (same parts as I run on a regular basis) neither have dyed very well, they take the colour but it’s dilute compared to the original vivid colour. I have run 5 parts ano’d together then dyed 3 red 2 blue.
Do you think both my dyes are now about usless, they were made up at the same time?

I did notice also that the last blue part I did before my break didn’t look quite as vivid.

Also I top up my ano tank occasionally with D.Water does anyone know what the ideal ph of the acid should be?
Can a weak or too strong acid tank cause this?

If it is my dye running out, do I need to scrap the 25 ltrs or can I buy one tub on dye and replenish rather than replace ?
I have had this dye made up for approx 9-10 months and have used it regularly but not excessivley.

Any help would be appreciated.
Thanks
Ishy