Algaecide and my lawn.

I own one of those inflatable pools, I’m sure you know the type, round, 10’ across about 2 + 1/2 ft deep. [Just enough room to float around on my inner tube on a hot afternoon!]

While I was away on holiday it developed a little algae. No worries as I have the appropriate algaecide, I have used it before, and, am confident I can remedy the situation quite easily.

Thing is, it’s the end of the season and I’d like to take the pool down. Usually I’d leave it a few days so it tests ‘no chlorine’ and then hook up my garden hose to the drainage hole and use the water to water the plants. Then take the pool down and store it for the winter. Easy-peasy.

But it will be much easier to use the algaecide to clean the pool before emptying it than to try and clean it off the pool bottom once it’s empty.

So my question to you is; if I use the algaecide to fix the problem, can I then use the water on the lawn and gardens without fear?

Usually I only have to be concerned with the chlorine and my test kit tells me when it’s all gone. However the test strip won’t tell me how much algaecide is present.

Anyone have any idea or have dealt with this issue before?

I’d greatly appreciate any advice you can give me.

Somebody ?

Shameless bump? (you caught me).
hmmmm…maybe I should ask Cecil, what do you think?

It would help if you actually told us what the Algaecide you were using is. So, what is it?


and again,


That would be Olin HTH algicide 10.

Not only did I not name the product, but I didn’t even spell algicide right !


Thanks for pointing out the error of my ways, Doob !

Doobious, buddy, where’d you go?

You’re my only hope, well, you and Cecil.
(Honest, this is the last bump, I swear)

If it simply were a cholrinator it might not cause problems, but the chemical looks pretty complex: Poly(oxyethylene) (dimethylimino) ethylene (dimethylimino) ethylene dichloride. Big fancy name! From what I know of algaecides in aquariums is they cause problems for aquatic plants, but my guess is they don’t chlorinate the water.

Besides if you dump it on the lawn, and it kills it, you could simply order sod replacements or just seed the dead spot after running water through it.

If in doubt, don’t do it.


Using Swimming Pool Backwash to Irrigate Lawn

Water Conservation

Why not a test on a small patch of lawn? You should see a result in a few days, I would guess (although I am no expert when it comes to lawns.)

Thanks so much for your enquiries on my behalf, for your time and especially for the links.

I read through it all and learned much. Though most people would seem to be speaking of large in ground pools, mine holds not quite as much water as a spa or hot tub. But not being heated water it is not nearly so heavily chemically treated.

That said, algicide is also used for in ground pools and it was not mentioned as a serious concern for plant life so I believe I will dare it.

Thanks again.