I recently purchased a new home(foreclosure) with a marcite pool and spa. The pool has been neglected for about 3 or 4 months and a bunch of algae has accumulated. The bank paid for a pool guy to come out, fix the pump motor and clean the pool.
The pool guy drained the pool, removed all algae, bleached the stains and pressure washed. Unfortunately, the pool still has bad black and gray stains all over the bottom. He claims an acid wash might be an option besides re-painting the bottom.
Since the pool is screened in, there was no organic debris such as leaves and the stains were all caused by the algae growth.
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