So, my Dkh has dropped disatrously and due to the central heating being on all the time, my evaporation rate has been shooting though the roof. Lazily I'd thrown a bit of salted water in to top up and am now paying the price, salinity above 40ppt So now I'm slowly bringing the salinity back down to 35ppt and increasing the Dkh from (6.4 up to around a target of 11). I'm planning on doing this over a period of 10 days using my new dosing pump.