White powder in reservoir

[Jollygreengiant 3]

Hi all my first proper post on here so be gentle! Got a strange problem with my reservoir, just recently been getting something fall out of my tap water and it's causing my entire res to go cloudy and leaves behind a white powdery substance, id like to say it's limescale. It seems to happen if the water rises over a ph of 8 (tap water round here comes out at 7.4) and it's harder than Chuck norris. Has anyone else ever experienced this or knows how to fixit?

[slimjim 590]

hi, it sounds like lime or salts

what is the EC of your tap water?

how much feed and what range of feeding?

knowing things like this will help others  solve your problem

PEACE

[Jollygreengiant 3]

This my clean water res so it's just straight water it comes out the tap at 7-7.5 at around 245ppm

I usually let it sit for a couple days to let any chlorine evaporate

My guess was it was calcium falling out the water at the higher ph range I.e once the chlorine goes