ok people i changed my mind again.
gone with this.........
30 litres water mixed with 4 teaspoons of epsom salts mixed up well and filled res tank-yeh i emptied all the other stuff out 1st.rofl.
anyway cf is 5 and ph was 6.1 so ph'd down to 5.5
turned dehumidifier off and set inlines to come on every 15 mins for 15 mins a time all thru lights off so hopefully when i check hygrometer tomorrow it'll say what im looking for lower humidity.
reason i changed thie inlines is were experiencing the warmest ever february ever over here in sunny england so temps may go bit low during night but its rh i have issues with at present.....
heres hoping..............pkj