# Hydroguard question

**URL:** <https://ilgmforum.com/t/hydroguard-question/115031>\
**Category:** Hydroponics\
**Created:** [October 12, 2024, 12:53am UTC](https://ilgmforum.com/t/hydroguard-question/115031 "2024-10-12T00:53:09Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![jdw](https://avatars.discourse-cdn.com/v4/letter/j/dbc845/32.png) [@jdw](https://ilgmforum.com/u/jdw)\
**Post date:** [October 12, 2024, 12:53am UTC](https://ilgmforum.com/t/hydroguard-question/115031/1 "2024-10-12T00:53:09Z")

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Starting a rdwc in 17 gal totes, plan on using 20 gal of ro for my reservior how much hydro guard should i use and often do i add. Plan on changing res about every 10 days. @ Retiredoldguy

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**Author:** ![Serf](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/serf/32/1030048_2.png) [@Serf](https://ilgmforum.com/u/Serf)\
**Post date:** [October 12, 2024, 4:25am UTC](https://ilgmforum.com/t/hydroguard-question/115031/2 "2024-10-12T04:25:26Z")

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Follow the directions on the bottle. I use something much stronger but do it every res change. I have heard using too much can cause a film on roots that can block uptake. So just on fresh changes and maybe midway before the next but havent used it in years.

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**Author:** ![Allinherhead](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/allinherhead/32/525479_2.png) [@Allinherhead](https://ilgmforum.com/u/Allinherhead)\
**Post date:** [January 11, 2025, 3:14pm UTC](https://ilgmforum.com/t/hydroguard-question/115031/3 "2025-01-11T15:14:36Z")

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What are you using instead

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**Author:** ![Low](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/low/32/1169155_2.png) [@Low](https://ilgmforum.com/u/Low)\
**Post date:** [January 11, 2025, 4:33pm UTC](https://ilgmforum.com/t/hydroguard-question/115031/4 "2025-01-11T16:33:39Z")

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I’d bet Southern AG

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**Author:** ![Serf](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/serf/32/1030048_2.png) [@Serf](https://ilgmforum.com/u/Serf)\
**Post date:** [January 11, 2025, 6:48pm UTC](https://ilgmforum.com/t/hydroguard-question/115031/5 "2025-01-11T18:48:15Z")

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Southern AG and King Crab(same people who make great white and orca)

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**Author:** ![StonedCold13](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/stonedcold13/32/1094279_2.png) [@StonedCold13](https://ilgmforum.com/u/StonedCold13)\
**Post date:** [January 11, 2025, 7:19pm UTC](https://ilgmforum.com/t/hydroguard-question/115031/6 "2025-01-11T19:19:30Z")

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Current 12 week Rez, top off only and use S. AG 👍🏻💚🤘🏻

 ![IMG_20250104_180728180_HDR_101556](https://global.discourse-cdn.com/growingmarijuana/original/4X/0/e/a/0eafbf0658f0d5bb0538ac203cdc5b62f9a231fe.jpeg)

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**Author:** ![Zostevaner](https://avatars.discourse-cdn.com/v4/letter/z/67e7ee/32.png) [@Zostevaner](https://ilgmforum.com/u/Zostevaner)\
**Post date:** [January 21, 2025, 1:33pm UTC](https://ilgmforum.com/t/hydroguard-question/115031/7 "2025-01-21T13:33:19Z")

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For Hydroguard, use 2 ml per gallon of water, so for a 20-gallon reservoir, you’ll need 40 ml. Add it each time you change the reservoir (every 10 days) and after topping off with significant amounts of water. Keeps roots healthy! 🚿🌱