# Question about DWC + Hardwater ppm **URL:** \ **Category:** Watering\ **Tags:** indoor-grow\ **Created:** [October 17, 2024, 10:56pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154 "2024-10-17T22:56:32Z")\ **Posts on this page:** 17\ **Page:** 1
**Author:** ![Maurice87](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/maurice87/32/1035682_2.png) [@Maurice87](https://ilgmforum.com/u/Maurice87)\ **Post date:** [October 17, 2024, 10:56pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/1 "2024-10-17T22:56:33Z")
Hello there. I have a question about hydroponics. I usually grow my plants organically, but I’m trying out deep water culture (DWC) during the colder months. My tap water has a PPM of 150, and my nutrient feed schedule recommends 250-300 PPM for early growth. Should I add the recommended PPM to my water’s current PPM (for a total of 400-450 PPM), or should I subtract the PPM in my tap water from the recommended PPM (250-300 minus 150)? I would greatly appreciate your help in understanding this. Thank you for your time and consideration. It’s the only variable I’m having an issue finding a definitive answer to. ---
**Author:** ![OGIncognito](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/ogincognito/32/475294_2.png) [@OGIncognito](https://ilgmforum.com/u/OGIncognito)\ **Post date:** [October 17, 2024, 11:04pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/2 "2024-10-17T23:04:32Z")
Disregard your water source Growmie, it’s not bad at all or enough to consider. I would only feed the 250-300 during the seedling stage then bump that up to 600, 2 weeks later up to 800 and run 800-1000 to harvest 🤟 ---
**Author:** ![Maurice87](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/maurice87/32/1035682_2.png) [@Maurice87](https://ilgmforum.com/u/Maurice87)\ **Post date:** [October 17, 2024, 11:22pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/3 "2024-10-17T23:22:32Z")
Okay, cool. Thanks for confirming this. ---
**Author:** ![OGIncognito](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/ogincognito/32/475294_2.png) [@OGIncognito](https://ilgmforum.com/u/OGIncognito)\ **Post date:** [October 17, 2024, 11:31pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/4 "2024-10-17T23:31:46Z")
Anytime Grow Bro and keep me posted. @Retiredoldguy runs a nice DWC set up if you need someone to guide you along the way 🤟 ---
**Author:** ![Maurice87](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/maurice87/32/1035682_2.png) [@Maurice87](https://ilgmforum.com/u/Maurice87)\ **Post date:** [October 17, 2024, 11:37pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/5 "2024-10-17T23:37:55Z")
Absolutely ---
**Author:** ![Retiredoldguy](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/retiredoldguy/32/1094346_2.png) [@Retiredoldguy](https://ilgmforum.com/u/Retiredoldguy)\ **Post date:** [October 18, 2024, 10:20am UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/6 "2024-10-18T10:20:54Z")
morning @Maurice87 @OGIncognito …OG gave you good advice and I am watching your thread now if you have questions… ---
**Author:** ![jdw](https://avatars.discourse-cdn.com/v4/letter/j/dbc845/32.png) [@jdw](https://ilgmforum.com/u/jdw)\ **Post date:** [October 18, 2024, 11:37am UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/7 "2024-10-18T11:37:29Z")
How much would you feed for clones? I’ gonna start my rdwc this weekend and don’t want to kill the little things. @Retiredoldguy@OGIncognito This is my first time using clones. ---
**Author:** ![Retiredoldguy](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/retiredoldguy/32/1094346_2.png) [@Retiredoldguy](https://ilgmforum.com/u/Retiredoldguy)\ **Post date:** [October 18, 2024, 11:42am UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/8 "2024-10-18T11:42:04Z")
I would start with 300ppm and then adjust higher after they get adjusted to the new DWC… ---
**Author:** ![jdw](https://avatars.discourse-cdn.com/v4/letter/j/dbc845/32.png) [@jdw](https://ilgmforum.com/u/jdw)\ **Post date:** [October 18, 2024, 12:03pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/9 "2024-10-18T12:03:33Z")
Thanks! Gonna use Jack’s 321 used Jacks RO blend last round but didn’t like the results as well as the 321 blend. @Retiredoldguy ---
**Author:** ![Retiredoldguy](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/retiredoldguy/32/1094346_2.png) [@Retiredoldguy](https://ilgmforum.com/u/Retiredoldguy)\ **Post date:** [October 18, 2024, 12:12pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/10 "2024-10-18T12:12:54Z")
I am not a Jacks user so won’t have any good advice about using it… I use the General Hydroponics line…but if you have questions we can get answers as there are hydro growers in this forum that do use it… ---
**Author:** ![OGIncognito](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/ogincognito/32/475294_2.png) [@OGIncognito](https://ilgmforum.com/u/OGIncognito)\ **Post date:** [October 18, 2024, 1:21pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/11 "2024-10-18T13:21:31Z")
I’ve used several of the Jacks lines and would recommend staying with the 321 🤟 ---
**Author:** ![jdw](https://avatars.discourse-cdn.com/v4/letter/j/dbc845/32.png) [@jdw](https://ilgmforum.com/u/jdw)\ **Post date:** [October 18, 2024, 1:33pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/12 "2024-10-18T13:33:01Z")
I agree. Thanks ---
**Author:** ![Maurice87](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/maurice87/32/1035682_2.png) [@Maurice87](https://ilgmforum.com/u/Maurice87)\ **Post date:** [October 18, 2024, 3:13pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/13 "2024-10-18T15:13:07Z")
Thank you so much! i’ve got everything setup. Im using the mars hydro DWC bucket system that I got off a co worker of mine. just waiting on these autos that I harvested to finish up drying in said tent before I proceed. I do have a question now that I think of it. as mentioned earlier, my tap water is considered barely “hard” @ 150-160ppm, with that being said, should I even bother using CalMag? the nutrient lineup I plan on using is Humboldts Secret Starter Kit Pack. which basically comes with their base A + B, Silica, Enzymes, P-K Booster, CalMag+Iron. i’ve been trying to look up what exactly is inside our local water supply. the only thing I could find is this from a 2023 drinking water analysis. ![tester 1](https://global.discourse-cdn.com/growingmarijuana/original/4X/0/e/0/0e0e2e57e714d7b289bbad8b1a667af4fca2010a.png) ![tester 2](https://global.discourse-cdn.com/growingmarijuana/original/4X/5/2/b/52b93ccc8c80a5ca237b84fe7bc03f3d75af39ab.png) ---
**Author:** ![Retiredoldguy](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/retiredoldguy/32/1094346_2.png) [@Retiredoldguy](https://ilgmforum.com/u/Retiredoldguy)\ **Post date:** [October 18, 2024, 4:09pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/14 "2024-10-18T16:09:40Z")
my understanding is Calmag is really only needed for RO and distilled water applications…so I don’t think you need to add any to your nutrient line up… ---
**Author:** ![Laylow860](https://avatars.discourse-cdn.com/v4/letter/l/7feea3/32.png) [@Laylow860](https://ilgmforum.com/u/Laylow860)\ **Post date:** [October 30, 2024, 8:59pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/15 "2024-10-30T20:59:16Z")
Hey Dupri to Nutley in but I’m new to all of this and I’m having trouble with my ph is high i have no nutes because i just changed the pot to a five gallon with fox farm soil but everything isn’t going like i want a friend said it’s too high i got the thing to put in the soil to read it and it’s at like 9 and I’ve tried ph down for the last three weeks at 5.5 and it’s still high please help anyone ---
**Author:** ![Laylow860](https://avatars.discourse-cdn.com/v4/letter/l/7feea3/32.png) [@Laylow860](https://ilgmforum.com/u/Laylow860)\ **Post date:** [October 30, 2024, 9:01pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/16 "2024-10-30T21:01:00Z")
Sorry i don’t know what the first couple words are lol ---
**Author:** ![OGIncognito](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/ogincognito/32/475294_2.png) [@OGIncognito](https://ilgmforum.com/u/OGIncognito)\ **Post date:** [October 30, 2024, 9:09pm UTC](https://ilgmforum.com/t/question-about-dwc-hardwater-ppm/115154/17 "2024-10-30T21:09:52Z")
If that meter you’re using is a soil moisture PH probe, they’re not accurate with PH reading. If you don’t have run off to test the PH and PPMs you can do a soil slurry test. It’s more accurate and will let you know the Soil PH and PPMs 🤟