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ash93

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4 years ago
ash93
@ash93, OK, so here's how I learned how to measure PPM. The number itself isn't really important, it's how the number changes over time. So what I do is first thing I measure the PPM of my water to see what the baseline is. I use 2 parts distilled/1 part tap. That gives me a baseline of 100ish ppm. Then I add whatever nutrients the manufacturer recommends for that week. If it's a young plant, I'll start with 1/4, then 1/2, etc. But the point is I'm not trying to reach a specific PPM, I'm just putting in what the manufacturer recommends. Then I measure the whole thing. Say for example it comes to 1100. So I know that 100 of that is my water, so 1000 is nutes. OK, so I change the reservoir. Now I measure every day. If the water level goes down and ppm stays the same, then the plant is using the nutes efficiently and things are good. If the ppm goes down with the water level, the plant needs more nutes the next res change. If the ppm goes up as the water level decreases, then there are too many nutes for the plant to absorb so you need to change res quickly. So I measure the PPM the same time every day, both before and after I add PH'd water (distilled in my case), before so I can see how well the plant is absorbing nutrients and after so I can set a new baseline for the next day. Make sense? Also, unless I have some problem, I'm not going to change the res more than once a week. I will add distilled water every day, but as long as the initial nute load is correct, 7-10 days between res changes has been the norm
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