Im fairly sure there is some chlorine in auckland water, the reason most people dont both though is because the fish dont seem to care unless its a huge waterchange
JBL balls must be Left UNDER the substrate, and dont disturb it ever, they last about a year, but if dugout, they caise a aglae bloom thing, and the water goes light brown/white.
Barry, i dont think her problem is the fact you cant park there, its more the inappropriate/lack of signage used to notify people not to use the carpark when not at the supermarket