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We opened the tank walls on two sides by removing one metal sheet. We lofted the liner instead removing steel roof and liner. We digged the sand layer out. We placed a 3 inch concrete slab on top of the platform. We covered the slab with a 3 inch sand layer. The sand was sieved to make sure no insects (termites/ants) are back-filled and the sand was treated with a 1% chlorine solution inside the tank. Liner down, metal sheets back. Only tricky remaining part is that the screws of the metal sheets should be holded manually from inside while closing the nuts from outside and the corners of the metal sheets need to covered by solid black tape to prevent liner damages...

We opened the tank walls on two sides by removing one metal sheet. We lofted the liner instead removing steel roof and liner. We digged the sand layer out. We placed a 3 inch concrete slab on top of the platform. We covered the slab with a 3 inch sand layer. The sand was sieved to make sure no insects (termites/ants) are back-filled and the sand was treated with a 1% chlorine solution inside the tank. Liner down, metal sheets back. Only tricky remaining part is that the screws of the metal sheets should be holded manually from inside while closing the nuts from outside and the corners of the metal sheets need to covered by solid black tape to prevent liner damages... damages...