Okay, I know there are no stupid questions, but this one really pushes the envelope . . .
Is it okay to clean my test tubes in tap water afer finishing a test, and then dry them well before their next use (which is usually 48 hours later)?
filter can only process about 50 gallons of water before it needs to be replaced, and they're expensive, so I'm trying to only use my DI
water for tank purposes. So, can test tubes be cleaned in tap water if they have pleanty of time to dry out??
Just wondering . . .