I am growing using an nft system, circulating the nute solution 24/7. so far so good

The ph of my tap water is 7.4 and ec or cf is 0.1 or 01

Should I use hard or soft water nutes?

I have been using hard water nutes but the ph has been nose diving over 24 hrs and I have had to use a lot of ph up which cannot be good for the plant.

Then use soft water but the same brand

All different brands have different buffering capabilities so stick with the same brand

Owd

thanks Owderb, sometimes its difficult to make the obvious decision and need a gentle push.

your lucky mate to have tap water with a e.c of 0.1 i only get that with a r/o filter