Remedies like GSE and apple cider vinegar serve as alternative-medicine antimicrobial agents, and, efficacy debate aside, have a definite effect on a bird's homeostasis.
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Even suposedly innocent sounding treatments such as ACV do have an effect by changing the pH in the digestive tract...thus these type of treatments have to be followed up with probiotics to restore the intestinal flora and pH.
Also, if you do not have an avian vet close by you can call a regular vet and ask them if they work with a lab that also processes avian specimans and cultures. If they do then you can have them do a culture.
In looking at your pix's if there was a giardia problem you would also see some mucous in the droppings. And if a bacterial problem some of the white urates would be thready and stringy looking. The urine looks alittle discolored in the second pix. That could be dehydration or the color affected by what was eaten.
Many times we are warned in what we read to avoid any salt in the diet because it is bad for them. We can go to the extreme that it could also contribute to health problems.
Salt/sodium is beneficial in birds with digestive disorders, such as passing whole seeds. It is necessary for the production of hydrochloric acid in the proventriculus, and also the muscle tone in the gizzard for grinding foods. It is also benefical for laying hens to help with good muscle contractions.
Very lightly salted rice water helps to halt additional dehydration when a bird has diarrhea. It helps to maintain the osmotic pressure in the body, thus protecting against excessive fluid losses.
A vet can prescribe a very dilute solution of hyrdochloric acid to help with muscle tone in the gizzard to properly grind up food/seeds.
