Hi up to now iv been growing in soil in aut pots not done to bad but want to change to coco still in auto pots on next grow with a ro system as my water hardness is bad and tap water EC is 0.7 iv been using this a a feeding guide and using canna tera as a guide week 1-4 ec 0.6-0.8 NB as my water is very hard and had a EC of 0.7 i was bumping week 2-4 to 1.1 EC week 4-6 ec0.8-1.2 week 8-9 ec1.2-1.8 Nb ushaly endinmg up at 1.5-1.6 week 9-11 ec0.8-1.1 as water is so hard then no nutes /flush to chop with cana pk and a bit of rihizotonic iv decided to try coco now instead of soil in autopots for next grow and i have orded a 5 stage RO system was planing on buying baged canna coco and mixing it to 70/30 perlite iv ordered canna coco a and b i know i will need to add cal mag how much calmag would you guys recomend should i use canna state too ? can you guys help me aout a bit please with a feeding sheduale. one other thing this grow i had a fungas gnat prob can i top coc with sand if i need to and get the fookers againg hopefully i wont they cam with the bag of soil this time oh here is my warter i arear but i will soon have a 5 stage RO system installed it on order WATER HARDNESS The hardness of water in the Affinity Water area occurs naturally and is characterised by the presence of high levels of calcium and magnesium, which are good for healthy teeth and bones. CALCIUM 149 mg/l Calcium is the principal constituent of hardness. TOTAL HARDNESS 372.5 mg/l Total hardness is usually expressed in terms of calcium carbonate and is measured in milligrammes per litre (mg/l) which is the same as parts per million (ppm). The recognised classification scheme we are using is: 0-75 soft, 76-150 moderately hard, 151-300 hard, 300+ very hard. Your water is very hard. Degrees English (or Clarke) 26.075 phContent hardness measurement is used on some British appliances. Degrees German 20.86 phContent is used on some German appliances. Degrees French 37.25 phContent is used on some French appliances. MILLIMOLS 3.725 mmol/l Millimols per litre. Some appliances refer to water hardness in millimols per litre (mmol/l). FLUORIDE 0.111 mg/l Fluoride naturally occurs in the water in many areas. Affinity Water does not add any fluoride to your water. Fluoride is measured in milligrammes per litre (mg/l).