BioGuard SoftSwim Stain Control | Stain Preventer

BioGuard SoftSwim Stain Control is a sequestrant formulated specifically for the biguanide chemistry of the SoftSwim program. It keeps dissolved iron, copper, and manganese locked in solution so they can't settle out and stain pool surfaces — and it does a second job that matters just as much on a biguanide pool.

It helps maintain the presence of SoftSwim B and C. That's not a minor footnote. Dissolved metals interfere with biguanide sanitizer and clarifier, quietly consuming them and shortening how long a residual holds. On a program where the sanitizer is the single most expensive recurring product, metals in the water are costing you money every week whether or not you ever see a stain.

There's one requirement that's easy to miss and expensive to skip: Stain Control must be used when starting a white plaster pool on SoftSwim B — whether metals are present or not. That's not a recommendation scaled to your water test. It's a condition of the start-up, and it applies to every white plaster SoftSwim pool.

Beyond that, it's needed whenever metals are present in any pool type or in the make-up water, and at spring start-up and after any significant refill — the moments when new water brings new metal into the pool.

Dosing is keyed to a measured metal level rather than pool volume alone: 1 quart per 10,000 gallons controls up to 2 ppm of metals. Above 2 ppm you need proportionally more, plus a filter aid to physically remove what the sequestrant is holding.