Fish Water = Houseplant fertilizer - The Planted Tank Forum
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post #1 of 17 (permalink) Old 10-26-2011, 04:34 AM Thread Starter
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Fish Water = Houseplant fertilizer

Anyone use their FW fishwater as houseplant water?

Do I need to dilute it?

Is water conditioner salt in FW toxic to plants?
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post #2 of 17 (permalink) Old 10-26-2011, 04:35 AM
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I definitely would not put water with any kind of extra salt on houseplants. It will accumulate in the potting media and eventually burn the plant.
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post #3 of 17 (permalink) Old 10-26-2011, 05:09 AM
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Yes, No, Yes
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post #4 of 17 (permalink) Old 10-26-2011, 05:34 AM
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Quote:
Originally Posted by AirstoND View Post
Anyone use their FW fishwater as houseplant water?

Do I need to dilute it?

Is water conditioner salt in FW toxic to plants?
The salt in question is Sodium thiosulfate which reacts with chlorine:

4 NaClO + Na2S2O3 + 2 NaOH → 4 NaCl + 2 Na2SO4 + H2O

However, this reaction produces so little salt it's completely negligible. Nothing to worry about.
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post #5 of 17 (permalink) Old 10-26-2011, 06:14 AM
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Quote:
Originally Posted by AirstoND View Post
Anyone use their FW fishwater as houseplant water?

Do I need to dilute it?

Is water conditioner salt in FW toxic to plants?

yes no no. No need for diluting. It's probably just because how I was raised. All "dirty" water we don't just throw it to the sink. Aquarium water, water from rinsing rice, we all dump it in front of our front yard & back yard garden. I even peed next to my papaya tree when I was small and no problem at all.


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post #6 of 17 (permalink) Old 10-26-2011, 06:47 AM
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I use the water from my changes on my tomatoes. Never a problem and they always grow great. I do not use any kind of chemical anythings in my tank though, so cannot comment on the salt thing. I would say no on the salty water from a tank, but would say the water out of conditioner would be ok. Never heard of anyone losing plants because they used a water conditioner. My parents actually have one and water healthy houseplants regularly.


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post #7 of 17 (permalink) Old 10-26-2011, 07:04 AM
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Watering plants with aquarium water is something people have been doing for a very long time.

Salts are going to build up in your pots even if you use plain tap water unless your water is fairly soft.

It is a good idea to occasionally flush your pots by putting them in the sink, tub, or outside and running water through them for several minutes to flush away extra deposits. This can be problematic with very large, indoor pots, so it isn't a bad idea to install a drain in these pots before you plant them.
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post #8 of 17 (permalink) Old 10-26-2011, 11:58 AM
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YES it is an old time practice. House plants, and in the garden too.

On potted plant salt/mineral build up. I repot annually or every other year. I root prune and add new soil. My houseplant live outside after/until the frost. The get weekly aquarium water, rain and tap water daily in runs of hot weather. I never get visible build up however, I know it does happen.

I think the rain & aquarium water does help neutralize & flush the minerals a bit. Our oldest houseplant is from the late 70's.
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post #9 of 17 (permalink) Old 10-26-2011, 03:02 PM
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Yes, I use it for the garden. I don't see a problem with it for house plants either... You're supposed to repot once in a while anyway so any mineral build up isn't a problem.


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post #10 of 17 (permalink) Old 10-26-2011, 03:14 PM
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I used my old fish tank water in my garden all year. Plus, all the poop you siphon out is good for the garden since it's a free fertilizer.


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Who would have thought that plants like dirt?!
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post #11 of 17 (permalink) Old 10-26-2011, 05:50 PM
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My plants love my fish water. Since I started using it they have had a lot of new growth.
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post #12 of 17 (permalink) Old 10-26-2011, 05:54 PM
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I dont understand the confusion here.

Get a bucket DIP it into the tank, pour in house plants. Why is salt being brought up?

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post #13 of 17 (permalink) Old 10-27-2011, 01:01 AM Thread Starter
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I dont understand the confusion here.

Get a bucket DIP it into the tank, pour in house plants. Why is salt being brought up?
The thiosulfate salt and polymers in water conditioner (Amquel,Stress Coat) is what helps build up protective fish slime, so I figured this might affect houseplant roots if used for watering. Ultimately I guess it's just good practice to immersion fill houseplants with distilled water to flush out salt buildup that might occur otherwise. I also noticed my tank's pH is relatively high which is preferably good for mint plants, on the other hand indoor citrus plants (like Kumqquat,Meyer lemon) prefer acidic, high nitrate soil.

Thanks for the answers everyone...
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post #14 of 17 (permalink) Old 10-27-2011, 01:36 AM
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I use it.

Works wonderful.

My Grandma said she used to use it when she was younger.


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post #15 of 17 (permalink) Old 10-27-2011, 02:16 AM
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I use mine all the time, when I do my water changes I check which tank has the most nitrates and use that water. I figure the extra ferts from dosing can't hurt either.
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