Just had my pool liner replaced and there was A LOT of noticeable corrosion on the aluminum wall panels that are behind the vinyl liner, the pool guy that did the liner told me that was due to the pool being a salt water pool and he scraped the corrosion off but told me it would just return and he suggested that I go back to using chlorine tabs or chlorine bleach to chlorinate the pool, WHAT IS YOUR SUGGESTION? Thanks!