The Villan Posted June 4 Author Share Posted June 4 Just now, Military Grade said: I could be wrong so take this with a pinch of salt(see what I did there ) But from quick maths you'd need to add 2.29mg of Magnesium per litre What about mine hahaha 1 Link to comment Share on other sites More sharing options...
latigid aikon Posted June 4 Share Posted June 4 Just now, The Villan said: Yes m8 a one off dose. Given that your water has almost no mag in it I'd give them a small dose in every watering so you fix it before problems start to show. 2 Link to comment Share on other sites More sharing options...
The Villan Posted June 4 Author Share Posted June 4 Just found this little snippet. This is a very soft water with low levels of all salts tested for. There is some alkalinity so it should hold a pH after mixing. This water will work with our soft water feed with no need for Cal/Mag but you will need to add a little pH up after mixing food plus water to raise the pH to 6.5 for coco or soil and 5.8 for hydro. Link to comment Share on other sites More sharing options...
Military Grade Posted June 4 Share Posted June 4 1 hour ago, The Villan said: This was my water analysis result. Calcium 18 Magnesium 1 If I'm calculating these right, yours would need 5mg of Magnesium per litre 1 Link to comment Share on other sites More sharing options...
The Villan Posted June 4 Author Share Posted June 4 1 minute ago, Military Grade said: If I'm calculating these right, yours would need 5mg of Magnesium per litre Ok cheers for that fella, but what is 5mg per ltr I only have scales that measure in grams 1 Link to comment Share on other sites More sharing options...
Military Grade Posted June 4 Share Posted June 4 18 ÷ 3 = 6 / to work out 3 to 1 ratio number of current calcium. 6 - 1 = 5 / use that number and subtract the Magnesium you already have giving you what needs to be added. Thanks how I calculated it 1 Link to comment Share on other sites More sharing options...
latigid aikon Posted June 4 Share Posted June 4 It's a bit more complex than that, Epsom Salts is more than just mag so you need to account for the other stuff too. 1 minute ago, The Villan said: what is 5mg per ltr A small pinch of (Epsom) salt 2 Link to comment Share on other sites More sharing options...
The Villan Posted June 4 Author Share Posted June 4 (edited) 2 minutes ago, latigid aikon said: It's a bit more complex than that, Epsom Salts is more than just mag so you need to account for the other stuff too. A small pinch of (Epsom) salt google said 0.005g so I take it thats a pinch when I asked google what a pinch was it told me to feck off nobhead hahahaha Edited June 4 by The Villan 1 Link to comment Share on other sites More sharing options...
Military Grade Posted June 4 Share Posted June 4 (edited) Epsom salt is Magnesium Sulfate, Oxygen and Water I've been winging my dosage all this time and I ain't had mag issues since, I live in a very hard water part of the UK. But if you want to be precise you'd probably be better off getting a bottle of Canna Mono Magnesium and working out what 5mg is in ml Edited June 4 by Military Grade 2 Link to comment Share on other sites More sharing options...
Larry Badgeley Posted June 4 Share Posted June 4 I will probably stick to OT's feeding chart and do a one off a Tbs/10 Litre of water 1 Link to comment Share on other sites More sharing options...
The Villan Posted June 4 Author Share Posted June 4 1tbs is 16g 1 Link to comment Share on other sites More sharing options...
ratdog Posted June 4 Share Posted June 4 3 hours ago, The Villan said: Calcium 18 Magnesium 1 i would definitely be adding calmag, yours is basically zero my water has a little more cal but 0 mag and my plants lap it up 2 Link to comment Share on other sites More sharing options...
BilgePump Posted June 4 Share Posted June 4 3 hours ago, The Villan said: 1tbs is 16g Just weighed a tbsp of vitax epsoms 3 times.. .. average was 14.06g , im guessing not all epsoms weigh the same 1 Link to comment Share on other sites More sharing options...
Boojum Posted June 4 Share Posted June 4 The crystals are fairly large and aren't uniform in size so every time you scoop a spoon out it will have different sized crystals with different amounts of air space between them resulting in different weights I'd imagine. 2 Link to comment Share on other sites More sharing options...
Shumroom Posted June 4 Share Posted June 4 I'd start with 0.5ml/l of Calmag with every watering How much are you feeding them?(sorry if that's on page 1, I missed it ) Atb Link to comment Share on other sites More sharing options...
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