Ponds and Water Gardening forum: Can I use cement blocks in my pond?

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springfield MO area (Zone 6a)
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Frillylily
May 3, 2017 11:10 AM CST
I have a pond about 3ft deep (or more) and 10 ft wide and 15 ft long. I have about 6 cement blocks in there now, and would like to put about 12 or so more in there. I have gold fish in it and so far no plants, because it is too deep! Id like to build it all up quite a ways w the blocks so I can set pots in it. Will this work?
Name: Sherry Godfrey
Carolina Shores, North Carolin (Zone 8a)
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SandDollarGarden
May 3, 2017 1:50 PM CST
That's what I have done in mine. The blocks also give my fish places to hide. I love water gardening!
springfield MO area (Zone 6a)
I was one of the first 300 contributors to the plant database! Plant Identifier
Frillylily
May 4, 2017 6:36 AM CST
oh, wow, thanks for the reply. I was afraid I was the only one wanting to fill my pond up with concrete blocks Green Grin! Glad to hear it is working for you, I'm gonna do it!
Name: Paul Anguiano
Richland, WA (Zone 7a)
GW & DG: tropicalaria
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psa
May 7, 2017 4:35 PM CST

Moderator

I've used concrete blocks in various ponds. It does tend to raise the pH a bit, but if you've got good water with other dissolved minerals in it, it won't make much difference, and you've got enough water there to see little effect anyway.
Name: Jay
Nederland, Texas (Zone 9a)
Region: Texas Region: Gulf Coast Charter ATP Member I helped beta test the first seed swap I helped plan and beta test the plant database. I was one of the first 300 contributors to the plant database!
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Horntoad
May 7, 2017 9:31 PM CST
It may raise the PH a little but goldfish actually prefer a slightly higher PH.
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Name: Paul Anguiano
Richland, WA (Zone 7a)
GW & DG: tropicalaria
Forum moderator Charter ATP Member I was one of the first 300 contributors to the plant database! Garden Ideas: Master Level Garden Sages Garden Photography
Enjoys or suffers hot summers Tomato Heads Organic Gardener Greenhouse Native Plants and Wildflowers Herbs
Image
psa
May 8, 2017 3:11 PM CST

Moderator

Goldfish actually raise the pH a bit with their copious ammonia output, but the concrete-born lime carbonates will start to buffer just before the water pH gets too high for them... Big Grin

(suppressing the water chemistry discussion that would probably bore everyone)

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