Jack’s Magic The Iron, Cobalt & Spot Etching Stuff – Stain Solution #1provides pool owners with an effective way to remove iron, cobalt, and other spot-etching stains without the hassle involved with pool drainage or manual scrubbing. Stain Solution 1’s unique chemical makeup is non-acidic, making it is safe for all pool types, and will not harm your pool’s finish. Working within 48 hours, this solution will require only minimal pool rebalancing, making pool maintenance simple and straightforward.