Chalky Residue In Pond Options

[airin]

hi

can anyone tell me why there is a white, powdery substance that clings to the air pumps and (sometimes sides of the wall)?

i have 2of 4x4 ft pond, and it happened a month ago, 2nd day after i'd changed water.

pls advise.

thanks,
airin.

[airin]

hi

thanks for your reply. basically i only added the anti-chlorine cystrals and the powder that makes the water less hard (sorry, am not technical at all), after filling the pond with regular tap water. i didn't add any other conditioner. mine's a pretty new pond, it's a fibre glass tank.

i discover the chalkiness after the 2nd day of changing water. The most serious was a month ago, all surfaces in the pond were covered with the chalk-like substance, the air stone especially.

hope the info's of help. let me know if you need more info.

thanks.