I am currently in the process of replacing a 20 x 40 Vinyl Liner that sits in steel walls and what looks to be a vermiculite base. I have removed the old liner and now have a few questions :-

It appears that the 8 year old walls have a whitish deposit on them - is that calcium / chlorine build up ? and if so should I be looking to remove the build-up before installing the new liner ? will this build cause problems down the line ?. I also have a noticed couple of rust spots on the walls - what is the best way to treat/remove rust from steel walls ?

I also have a couple of hairline cracks in the vermiculite bottom (deep end hopper), and seeps a little water when it rains - how should I be sealing these cracks ?

Thanks in advance for your help.

JJNMRSDAD