Here guys here a chart i use for me coco,so if anyone new and need that help this wat i do,
Seedlings, Early Sprouts.........100 ppm to 250 ppm--------0.2 ec - 0.5 ec this if i use DE-ionised water,im going two have to see what me rain water is,should be long befor i can get two test that

.OK let get on with it.
Early Vegging....................... ...300 ppm to 400 ppm--------0.6 ec - 0.8 ec
Full Vegetation.................... ....450 ppm to 700 ppm--------0.9 ec - 1.4 ec
Early Blooming...................... ...750 ppm to 950 ppm--------1.5 ec - 1.9 ec
Full Mature Blooms..................1000 ppm to 1600 ppm------2.0 ec - 3.2 ec
and if anyone is use Ferro nutrients and need any help with the mixing this what i do two every 10lts of water then i add my other goodies then ones iv add me ph down, to the right ph, my Ec spot on,and it hold it ph just nice,so this is my mix for veg and bloom,
10lts A&B. veg
12-mls=1.1
16-mls=1.2
20-mls=1.3
23-mls=1.4
10lts A&B Bloom
14mls=1.1
18mls=1.3
21mls=1.4
26mls=1.6
30mls=1.7
Bio roots is 4mls two 10lts-water
bio crop is 10mls 10lts-water
Enzyme plus 10mls 10lts-water
and ones in full-bloom i be adding PK-Booster Enriched 10mls 10lts-water,
this is good it be Analysis to the uk tap water
,
Kudo