Folks, if you've recently upgraded or renewed your annual club membership but it's still not active, please reach out to the BOD or a moderator. The PayPal system has a slight bug which it doesn't allow it to activate the account on it's own.
I swap mine as soon as its not 0 zero tds but I rarely do water changes so most of what its for is top off. Possible that your town added more chlorine to the water or chloromines to combat algae growth?