well i would deffinatly go get a cheap PH kit. you most likely will kill every plant you sprout if you dont know what the ph is. Ph is one of the most important things about growing. with a bad ph the plant cannot suck any nutrients and minerals out of the water, it should b between 5.8-6.0 some people say 6.0-6.5 but really it depends on the genetics of the plant. and i guess if its workin for ya then go for it. but still it would b a good idea to get some fox farm happy frog or fox farm ocean forest soil. theyre pretty much made to grow cannabis. but do what works for you.