# Runoff Numbers - High PPMs and Two Questions **URL:** \ **Category:** Indoor Growing\ **Tags:** nutes, ppm, flowering, autoflower, indoor-grow\ **Created:** [May 30, 2022, 3:27pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956 "2022-05-30T15:27:56Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![GrnyGrows](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/grnygrows/32/672946_2.png) [@GrnyGrows](https://ilgmforum.com/u/GrnyGrows)\ **Post date:** [May 30, 2022, 3:27pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/1 "2022-05-30T15:27:56Z")
White Widow auto. End of 11 weeks from seed in ground. Soil FFHF + FFOF + Pearlite. Indoor grow. Temps 80 degrees, 45% RH. Light 800 - 1000 PAR. All in flower, several already flushed for harvest over the next week or two. Others may take three weeks or so. All plants look healthy and happy. Two questions: 1. Do I need to flush out the non-flushed plants because ppm is so high? They are about three weeks (or more) from harvest. 2. What should I learn from this data? Non flushed plants got: Flowertime Nutes and CalMag at 6.2 pH going in and 30 ppms. The numbers: Not yet flushed plants – some really high ppm #s. Water out/ppms out #7 6.1/3800 ppm #8 6.2/2800 #4 6.4/2300 #2 Zebra 6.2/2845 #5 6.3/3200 Flushed plants – all under 2000 ppms. Water out/ppms out #10 6.2/1300 #6 6.3/1976 #9 6.2/1850 ![20220529_103656](https://global.discourse-cdn.com/growingmarijuana/original/4X/c/a/a/caaa4fc379089776f713570571dd2b5cd7c77508.jpeg) These are the plants with the high ppms. ---
**Author:** ![beachglass](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/beachglass/32/683364_2.png) [@beachglass](https://ilgmforum.com/u/beachglass)\ **Post date:** [May 30, 2022, 6:08pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/2 "2022-05-30T18:08:37Z")
Hi @GrnyGrows . I had to flush my ww last week. She was up in 3000. flushed til a lot …finally the next reading 2100 ish so…now i wait ---
**Author:** ![kellydans](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/kellydans/32/580751_2.png) [@kellydans](https://ilgmforum.com/u/kellydans)\ **Post date:** [May 30, 2022, 6:26pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/3 "2022-05-30T18:26:20Z")
If you choose to flush the plants with the high PPM numbers , I would Follow up with some Bloom nutes. Maybe 1000 PPM Do you normally water or feed to about 20% run off Good luck ---
**Author:** ![GrnyGrows](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/grnygrows/32/672946_2.png) [@GrnyGrows](https://ilgmforum.com/u/GrnyGrows)\ **Post date:** [May 30, 2022, 7:38pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/4 "2022-05-30T19:38:40Z")
Yep I water/feed to run off every time. I’ve been told by a guy who I trust implicitly, that trying to react to ppms in soil is about impossible because we just don’t know if the tds readings are impacted by the dirt in the runoff. ---
**Author:** ![GrnyGrows](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/grnygrows/32/672946_2.png) [@GrnyGrows](https://ilgmforum.com/u/GrnyGrows)\ **Post date:** [May 30, 2022, 7:39pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/5 "2022-05-30T19:39:20Z")
So, you think I should flush all of them (5) and then next watering start with bloom nutes again? ---
**Author:** ![kellydans](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/kellydans/32/580751_2.png) [@kellydans](https://ilgmforum.com/u/kellydans)\ **Post date:** [May 30, 2022, 9:07pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/6 "2022-05-30T21:07:06Z")
I always water to run off I don’t see my numbers climb but I also keep watch on my PH. But if you choose to flush follow up with feeding they will need that to get to the finish line. ---
**Author:** ![beardless](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/beardless/32/275814_2.png) [@beardless](https://ilgmforum.com/u/beardless)\ **Post date:** [May 30, 2022, 9:35pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/7 "2022-05-30T21:35:55Z")
Increasing runoff PPM means the plants are taking in less than you are giving them. This also coincides with the decreasing pH. Nutrients / salts are building up in the rootzone. For me, over 3000 PPM was usually not an issue. I paid more attention to the pH side. If you are that close to harvest, I am thinking back off on the feed ppm - maybe 50%, and use a higher pH like 6.8 - 7.0. Also have more runoff than normal. Hopefully this will wash out some of the excess while providing a higher pH late in flower. ---
**Author:** ![GrnyGrows](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/grnygrows/32/672946_2.png) [@GrnyGrows](https://ilgmforum.com/u/GrnyGrows)\ **Post date:** [May 30, 2022, 9:36pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/8 "2022-05-30T21:36:09Z")
I watch my pH like a hawk and I’m happy with that part of the equation. So, I’ll have to decide what to do. ---
**Author:** ![GrnyGrows](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/grnygrows/32/672946_2.png) [@GrnyGrows](https://ilgmforum.com/u/GrnyGrows)\ **Post date:** [May 30, 2022, 9:37pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/9 "2022-05-30T21:37:09Z")
Do I need or want a higher runoff ph than 6.2 ish? ---
**Author:** ![kellydans](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/kellydans/32/580751_2.png) [@kellydans](https://ilgmforum.com/u/kellydans)\ **Post date:** [May 30, 2022, 10:12pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/10 "2022-05-30T22:12:28Z")
Water to run off couple times in a row with ph water 6.5 See if your PPM number comes down. ---
**Author:** ![beardless](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/beardless/32/275814_2.png) [@beardless](https://ilgmforum.com/u/beardless)\ **Post date:** [May 30, 2022, 10:38pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/11 "2022-05-30T22:38:59Z")
> [@GrnyGrows](#): > > unoff ph than 6.2 ish? Regarding pH & ppm when I transplant into final containers I get a good amount of runoff. I use it and the next couple as a baseline to gauge where the numbers go later on. My pH rule of thumb was if it changes more than .5 I take corrective actions. I start with mini flushes like I described above (basically overwater to create more runoff)… If the numbers do not change enough, I will flush. These are pH charts. ![PH chart KootMed](https://global.discourse-cdn.com/growingmarijuana/original/4X/c/7/c/c7c436f9920e9510af4405fd0a3d5d18f45e8d5f.jpeg) ![PH chart - Soil growweedeasy](https://global.discourse-cdn.com/growingmarijuana/original/4X/d/f/a/dfa84fce86aaef5b0e66787f864c50be9b52630a.jpeg) If following Kootmed 6.2 is slightly out of range on the low side. According to growweedeasy it is in range but still on the low side. I would try to raise it a bit like @kellydans and I described. Feed with a higher pH than you have been using and produce more runoff then normal. Basically trying to raise pH and lower ppm using a light hand rather than flooding it this far along. ---
**Author:** ![GrnyGrows](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/grnygrows/32/672946_2.png) [@GrnyGrows](https://ilgmforum.com/u/GrnyGrows)\ **Post date:** [May 31, 2022, 12:40pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/12 "2022-05-31T12:40:33Z")
What’s wrong with my pH runoff at 6.1 - 6.2? It’s the ppms that freak me out. ---
**Author:** ![GrnyGrows](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/grnygrows/32/672946_2.png) [@GrnyGrows](https://ilgmforum.com/u/GrnyGrows)\ **Post date:** [May 31, 2022, 12:41pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/13 "2022-05-31T12:41:09Z")
Ah so pH will lower ppms? What? I’m working so hard to learn all of this. ---
**Author:** ![kellydans](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/kellydans/32/580751_2.png) [@kellydans](https://ilgmforum.com/u/kellydans)\ **Post date:** [May 31, 2022, 12:48pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/14 "2022-05-31T12:48:15Z")
Correct PH will promote uptake for all the nutrients plant needs. PPM should come down with a couple waterings to run off with ph at 6.5 ---
**Author:** ![GrnyGrows](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/grnygrows/32/672946_2.png) [@GrnyGrows](https://ilgmforum.com/u/GrnyGrows)\ **Post date:** [May 31, 2022, 12:48pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/15 "2022-05-31T12:48:57Z")
Oh baby, I’m all over this. We grow, we learn, we laugh at what we don’t know. ---
**Author:** ![kellydans](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/kellydans/32/580751_2.png) [@kellydans](https://ilgmforum.com/u/kellydans)\ **Post date:** [May 31, 2022, 12:51pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/16 "2022-05-31T12:51:43Z")
Oh yeah grow grow grow Very enjoyable hobby with a few challenges. We’re all learning and sharing together. Happy growing ! ✌ ---
**Author:** ![beardless](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/beardless/32/275814_2.png) [@beardless](https://ilgmforum.com/u/beardless)\ **Post date:** [May 31, 2022, 12:56pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/17 "2022-05-31T12:56:43Z")
> [@GrnyGrows](#): > > What’s wrong with my pH runoff at 6.1 - 6.2 If pH is too far out of range it can cause nutrient lockout. This basically means now matter how much you feed it it is able to take it in. And thus, it compounds a small issue. ---
**Author:** ![GrnyGrows](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/grnygrows/32/672946_2.png) [@GrnyGrows](https://ilgmforum.com/u/GrnyGrows)\ **Post date:** [May 31, 2022, 12:59pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/18 "2022-05-31T12:59:59Z")
I understand. I thought runoff of 6.1 or 6.2 was good? ---
**Author:** ![kellydans](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/kellydans/32/580751_2.png) [@kellydans](https://ilgmforum.com/u/kellydans)\ **Post date:** [May 31, 2022, 1:45pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/19 "2022-05-31T13:45:46Z")
Overall I think your plant’s look good . I have finished plants In that ph range Without issues, tag back in after a couple waterings on PPM # Keep up the good work @GrnyGrows ---
**Author:** ![GrnyGrows](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/grnygrows/32/672946_2.png) [@GrnyGrows](https://ilgmforum.com/u/GrnyGrows)\ **Post date:** [May 31, 2022, 1:58pm UTC](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956/20 "2022-05-31T13:58:07Z")
Thanks a million. I appreciate your knowledge and help. [Next page](https://ilgmforum.com/t/runoff-numbers-high-ppms-and-two-questions/87956.md?page=2)