When pool professionals talk about stain control, they usually mean one thing: avoiding the call nobody wants. A brand-new plaster job that mottles in week two. A salt cell that scales up before the Fourth of July. A spring opening that reveals brown streaks no one saw in October.

For decades, Jack’s Magic has focused almost exclusively on those moments — metals, minerals, and stains. Jack’s Magic is a line of specialty chemicals aimed at preventing and removing discoloration and scale without draining pools or acid washing when it can be avoided.

What follows is a practical look at where these products fit divided into two real-world categories: 1. Preventative chemistry during new pool start-ups.

2. Ongoing maintenance and stain removal, especially at spring opening.

Jack’s Magic and New Pool Start-Ups

New pool start-ups are chemistry in motion. Fresh plaster hydrates. pH rises aggressively. Calcium moves in and out of solution. Fill water introduces iron, copper, manganese, and sometimes cobalt. In salt pools, chloride concentration rises as salt is added, shifting ionic balance and total dissolved solids (TDS).

This is when prevention matters most.

Jack’s Magic built its reputation on sequestration chemistry — products that bind dissolved metals and certain minerals so they stay in solution instead of oxidizing or precipitating onto surfaces.

The most widely used in start-ups is: The Magenta Stuff This is a phosphonic-acid-based sequestering agent formulated for general stain and scale prevention. It is commonly used in:

• Fresh plaster start-ups.

• High calcium hardness regions.

• Pools where fill water may contain iron or copper.

• Saltwater systems. How it works: It binds dissolved metal ions (iron, copper, manganese) and interferes with calcium carbonate crystal formation. It does not remove metals from the water. It holds them in solution so the filter can gradually remove particulates and so oxidation does not plate them onto surfaces.

How it’s used at start-up:

• Balance pH, alkalinity, and calcium hardness first.

• Establish circulation.

• Add the recommended initial dose (typically around 1 quart per 10,000-15,000 gallons, depending on metal load).

• Maintain weekly maintenance doses during the first month.

The Magenta Stuff reduces the likelihood of staining and scaling. It does not eliminate the need to manage LSI. If water is driven scaleforming (high pH, high calcium, high alkalinity), no sequestrant can fully compensate.

Saltwater Pools: The Purple Stuff Salt systems introduce unique scaling risks, especially at the cell where pH locally spikes during chlorine generation. Formulated specifically for saltwater pools and high TDS environments, Purple Stuff is designed to remain stable under higher salinity and sanitizer conditions.

It is typically used:

• When salt is added at start-up.

• In regions with silica or heavy mineral content.

• As part of ongoing salt system maintenance.

Purple Stuff helps reduce scale formation inside salt chlorine generator cells and along tile lines. It does not clean a heavily scaled cell instantly, but it can slow accumulation and extend cleanings.

The Purple Stuff supports scale control in salt systems. Cell inspection and periodic acid cleaning are still necessary.

Specialty Situations at Start-Up

Jack’s Magic also produces:

• The Blue Stuff — traditionally used for metal sequestration in nonsalt pools, fountains, or decorative water features.

• The Pink Stuff — formulated for lower pH environments and certain commercial conditions.

In most residential plaster start-ups, Magenta or Purple are the primary choices depending on system type. Jack’s Magic and Spring Opening

Spring opening is when reality shows up. Winter evaporation may have concentrated metals. Leaves and debris may have introduced tannins. Municipal water chemistry may have shifted over the off-season.

You may not know there’s a problem until you pull the cover and find … stains.

This is where Jack’s Magic shifts from preventative chemistry to corrective chemistry.

Step One: Identify the Stain Guessing at stains leads to wasted product and frustration. Jack’s Magic offers a Stain Identification Kit, designed to help narrow down what you’re actually looking at before you treat it.

The kit works through simple onsurface spot tests. You apply a small amount of a specific identifying chemical directly to the stained area. If the stain lightens or disappears at the test spot, you’ve likely identified the culprit. The kit helps differentiate between:

• Iron.

• Copper.

• Cobalt.

• Scale (calcium-based deposits).

• Organic staining. This matters because each of these responds to different chemistry. Iron behaves differently than copper. Scale does not respond the same way as metal oxidation. Organic stains won’t respond to metal treatments at all.

The value of the kit is that it keeps you from throwing the wrong product at the problem.

Once you determine what removed or lightened the stain in the spot test, the next step is not simply “add more and hope.” Instead, you follow the full treatment procedure for that specific stain type — which may include lowering chlorine, adjusting pH, circulating continuously, and then applying the appropriate Jack’s Magic stain solution at the recommended dosage for the entire pool.

In other words, the identification test tells you which chemistry to use. The full treatment requires proper water preparation and follow-up sequestration to prevent the stain from returning.

That’s what makes the system effective — not just adding more product, but applying the right chemistry under the right water conditions.

Iron, Cobalt & Spot Etching

Use The Iron, Cobalt & Spot Etching Stuff (Stain Solution #1) This product is designed to remove iron and cobalt staining without draining the pool. Its typically used when:

• Brown or rusty stains appear.

• Well water introduces iron.

• Blue-gray discoloration suggests cobalt presence.

It works by reducing and solubilizing metal deposits so they return to solution, after which a sequestrant is required to keep them from re-depositing.

Usage typically involves: 1. Lowering chlorine to near zero. 2. Adjusting pH to recommended levels.

3. Adding the product with circulation.

4. Following up with a sequestrant (Magenta, Purple, or Blue).

Realistic expectation: Effective on true iron or cobalt staining. Not effective on scale or organic staining.

Copper & Scale

Use The Copper & Scale Stuff (Stain Solution #2) This product is formulated to address copper staining and certain scale deposits.

Copper staining is often teal, black, or gray and may come from:

• Heater heat exchangers.

• Algaecides.

• Fill water. Scale deposits appear white or gray and are calcium carbonate.

This product works by dissolving copper and scale deposits under controlled chemistry conditions. As with Solution #1, chlorine reduction and proper pH adjustment are required.

Realistic expectation: Works best when stains are correctly identified. Severe scale buildup may still require mechanical removal or acid washing.

Spring Opening Preventative Program

After stain treatment (if needed), spring chemistry typically includes: 1. Rebalancing pH, alkalinity, and calcium hardness.

2. Adding an initial sequestrant dose (Magenta, Purple, or Blue depending on system). 3. Establishing weekly maintenance doses.

This is especially important if fresh fill water is added during opening.

Supporting Products Jack’s Magic also produces:

• After Shock (Chlorine Reducer) — used when chlorine must be lowered prior to stain treatment.

• Surface Magic — assists in collecting floating debris for easier skimming.

• Tile and filter cleaners.

These products support service efficiency but are not substitutes for proper balance and filtration.

Realistic Expectations for Pool & Spa Service Technicians

Jack’s Magic products:

• Prevent many stains when used proactively.

• Help remove certain metal stains without draining.

• Assist in scale management.

• Support salt system longevity.

They do not:

• Replace water balance management.

• Remove metals from water permanently (they sequester them).

• Eliminate the need for filtration and brushing.

• Correct extremely scale-forming water on their own.

Sequestrants degrade over time, especially under high chlorine conditions. Maintenance dosing is necessary. In high- metal environments, partial drain and refill may still be required.

Jack’s Magic built its brand around stain and scale chemistry, and in that niche it remains relevant.

For new pool start-ups, especially plaster and salt systems, early sequestration is inexpensive insurance.

For spring openings, proper stain identification and targeted treatment can avoid draining and acid washing.

Used correctly — with realistic expectations and solid water balance — these products reduce callbacks and protect finishes.