ICP Test advice

[Etto]

I just got my first ICP test kit.

Should I collect the water after or before a water change?

Thanks

 

[Gatorpa]

I just got my first ICP test kit.

Should I collect the water after or before a water change?

Thanks

I’d do my WC then collect the next day to let things settle.
Also run test kits at the same time you collect your samples and see how close they are for future reference.

 

[Etto]

Thanks for your help