Pool guys make $400-$800 for doing this. You can make that in an hour with F9 barc and cause no damage to the siding. Hire a pool guy for $100 to empty and refill the pool. Go in, apply F9 and collect your check.
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Craig Harrison, Senior Technical Advisor for F9 BARC Rust Remover
1-855-803-1133
PURCHASE F9 BARC CONCRETE RUST REMOVER HERE
Member: The Assocation for Preservation Technology International