lake water if you can
depending on where you live(like me) well water can have way toooo many issues ppm is the main
where i live it fluctuates and to cut down alittle on cal/mag costs and r/o water i use about 10 percent well and the rest r/o
i like to collect rain and usually do but where i live this year we are in a heavy droubt and rain hasn't really been around till lately
but the lake water is collected rain water and not filtered through the bedrock layer down to the table where your well will collect and have all the alkalinity issues because of the filteration through the rocky layers
we have awesome soil here but deep it gets very limestone dense so our well water is very hard
could have some microscopic issues from the lake water nad introduce things like kinds of algea
soem things could be good some could be bad really would have to have it tested
at the very least i would buy a hand water filter to reduce the levels for sure or you will have nutrient issues later and if you do swing it enough for a harvest i promise the end harvest will be much smaller dealing w/ theese issues
your question about the ammonia is yes not to step on muddy's toes but most dollar general or grocery store still carry pure ammonia for floor stripping
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it could look like this
normlly i wouldn't get the lemon scented but this is the only one they had at the time w/ a surfactant added to it
and the scent isn't really a big deal i only use it in veg for a quick pick me up when needed a little extra
if one w/ a surfactant is used go easy on application because plant absorbs better when it is used so it is easier to give toxifying levels