We have some building works going on in the garden and have decided to incorporate a pond with a window for keeping outdoor fish in.
I am looking for some advice with regards to lining it and the glass from anybody else who has experience with this type of build.
The pond is built in block work currently with pillars supporting the corners (see picture). It will be rendered on the outside and we have left a section out to put a window. This will be sitting on supports on the inside and have a significant overlap to silicone etc.
The interior size of the pond is 190cm x 348cm. The window opening is 260cm x 46cm. However we plan on using glass which is 290 cm x 60 cm to give the overlap inside.
What type of glass have people used in aquariums/ponds of this nature? I have looked online at charts and calculations and it seems that we need 12mm. The water will not be going to the top edge of the glass probably around 15cm below. I am nervous though! These are my concerns.
12mm normal glass is around 3.5 safety rating. I don't feel like this is a good buffer.
12mm toughened would be super strong however I worry about the shatter issue and if anything did ever happen then the whole window would blow, possibly taking fish out of the waterfall that would ensue!
12mm laminted is this as strong as 12mm glass?
I have looked at laminated toughened glass however this is much pricier and not sure if it is complete overkill?
With regards to lining we are thinking of using ka tanking slurry with their corner fillet. I have spoken with them and they assure me it is safe to use as a pond liner in direct contact with the water for aquatic life but I was just wondering if anybody else had experience of using tanking slurry products?
I have attached a picture of the build in it's current state so that you can get an idea of it! I hope this helps! Really looking forward to any advice from you guys and gals!
I want my fishy friends to be safe!

I am looking for some advice with regards to lining it and the glass from anybody else who has experience with this type of build.
The pond is built in block work currently with pillars supporting the corners (see picture). It will be rendered on the outside and we have left a section out to put a window. This will be sitting on supports on the inside and have a significant overlap to silicone etc.
The interior size of the pond is 190cm x 348cm. The window opening is 260cm x 46cm. However we plan on using glass which is 290 cm x 60 cm to give the overlap inside.
What type of glass have people used in aquariums/ponds of this nature? I have looked online at charts and calculations and it seems that we need 12mm. The water will not be going to the top edge of the glass probably around 15cm below. I am nervous though! These are my concerns.
12mm normal glass is around 3.5 safety rating. I don't feel like this is a good buffer.
12mm toughened would be super strong however I worry about the shatter issue and if anything did ever happen then the whole window would blow, possibly taking fish out of the waterfall that would ensue!
12mm laminted is this as strong as 12mm glass?
I have looked at laminated toughened glass however this is much pricier and not sure if it is complete overkill?
With regards to lining we are thinking of using ka tanking slurry with their corner fillet. I have spoken with them and they assure me it is safe to use as a pond liner in direct contact with the water for aquatic life but I was just wondering if anybody else had experience of using tanking slurry products?
I have attached a picture of the build in it's current state so that you can get an idea of it! I hope this helps! Really looking forward to any advice from you guys and gals!
