Saving AI to svg

I created some art with a Rectangular grid tool. I created the shape, converted to a live paint and started my pixel art.

As I was done I tried to save it to SVG but when you open the image, it shows sort of transparent lines through the image. The file has to be a SVG file so can't compromise to a PNG.

My question is: How can I save a AI file (grid + live paint) to SVG without getting transparent lines through the image?