If you are looking for an eco-friendly product then you can manufacture your own FRP tank. It is a great idea to manufacture your own plastic products as it will save a lot of money as well as it will save a lot of energy.
https://medium.com/@abhiro/mak....e-your-own-handmade-
![image](https://www.plingue.com/upload/photos/2022/09/lQke9FSKqYdEZzwd3VaP_26_df0bbc42f50972c84f04047121097640_image.png)