Hard water

Look up what makes up that 280ppm online, you should be able to see exactly what is in your water.

But post some pics of your plants. So we can see what your talking about.
Dou you mean look up my local water info?
pH 7.2 - 7.6

Free Chlorine 1.0 - 2.0 mg/l

Combined Chlorine residual should be kept as low as 0.5 mg/l and should be no more than one-third of total chlorine.

Total Alkalinity 80 - 150 mg/l

Calcium Hardness 200 mg/l minimum

Total Dissolved Solids (TDS) maximum 1000 mg/l above supply water TDS to an absolute maximum of 3000 mg/l (2000 mg/l preferable)

Sulphate 360 mg/l maximum
This autoflower is in its 8th week so just hoping the buds fatten a bit. Don’t think there’s much more I can do to stop the leaves changing. Maybe it’s normal?
 

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