Sorry if posted in the wrong place. But I've been using the API test kits to measure phosphate and noticed I'm always getting back more than 0 back as a reading. Thought it was weird so I tested distilled water and it looks roughly the same.. 0.25-.5
Are my eyes off? Do you think the test solution went bad? Expiration date is 05/2025.
Are my eyes off? Do you think the test solution went bad? Expiration date is 05/2025.