KCl as an alternative to K2SO4

[Lukara]

Hi, I've been pulling my hair out trying to find K2SO4 with proper labelling of the stuff so that I be sure it is pure. I haven't had any luck :( , so I'm considering using KCl. For those of you who use it:

1) Is it a safe and effective alternative?
2) How much do you use?
3) Where did you purchase it?
4) What is the brand name that you use?

Thanks.

[Lukara]

Has anybody used NoSalt as a source of KCl? It contains Potassium chloride as it's first ingredient, potassium bitartrate, adipic acid, fumaric acid, silicon dioxide and mineral oil.

[crutch27]

Im not entirely sure about the potassium chloride question, but those additives don't sound good.

I read recently on here from Tom Barr about a nice source of Potassium Sulfate that is pure from www.litemanu.com. Its listed under Plant Nutrients, - Chemicals. It comes in 1lb bags, you probably would want to order multiple bags at once if you will be using a lot. I ordered just one the first time and realized after doing some math I will probably run out of 1lb after 6 months. They are a lot smaller than they seem when you order :).

They also have Potassium Phosphate and Potassium Nitrate as well. I ordered from them and am very happy with the results. Might give them a try if you want to stick with the K2SO4.

[hatton3]

Tom Barr sent me there as well. I ordered all three ferts and I'm very pleased. Should last me a long time.

[RockysDad]

I use a KCl in the form of water softener crystals found at Home Depot. Its usually comes in a 40lb bag but I just pick up a few pieces off the floor from a broken bag or just loose crystals that didn't make it in the bags. Anyway, I haven't had any problems with it so far. I'm not sure if it helped or not because I do not know what potassium deficency looks like in plants. Your safest bet would be to use K2SO4 but if its not available then KCl works just fine.

[Lukara]

http://www.hydroponics.com/ was recommended for some K2SO4 for Canadian residents. I placed an order and will be receiving some in a few days. Thanks to all for your help.