I'd just perhaps cut the PO4 in 1/2.
Otherwise, the rest ought to be fine.

There's not harm in adding 100% KH2PO4, but it's not likely you need it.
Howeverm the level of PO4 varies in the tap, it will move around, so do not rely entirely for PO4 from the tap, go a head and add light amount, say 1/2.

Regards,
Tom Barr

Thanks Tom.
dose this mix look ok.



Potassium Nitrate - 40g to 500ml of water and adding 10ml per 100L of water would give you a value of 5ppm.
Potassium Phosphate - 7.5g to 500ml of water and adding 5ml per 100L of water would give you a value of 1ppm.
Potassium Sulphate - 55g to 500ml of water and adding 10ml per 100L of water would give you a value of 5ppm
Magnesium Sulphate - 70g to 500ml of water and add 50ml once a week per 100L of water - this would give a target of 7ppm.
Trace mix - 15g to 250ml of water

all i did was to cut the P04 in half

Tom. so what you saying is i should only does half of the above amount. so that would be 5ml per 100L of water