Fill water can look perfectly clear and still wreck a startup. If there’s iron, copper, tannins, or other contaminants in the source, they can end up staining a new finish, clouding the water, and turning a “simple” startup into weeks of cleanup. We talk with Joe Laurino of Periodic Products, known throughout the pool industry for Culator metal removal, to get practical about what to test for and how to stop problems before the pool is even full. 

We dig into the difference between dissolved metals and tiny oxidized particulates, why well water is a special kind of tricky, and how even municipal water can carry hidden issues depending on the treatment plant and source. We also compare common pre-filters that rely mostly on pore size with higher-impact approaches that target metals and organics, including high-flow carbon and polymer-based filtration that doesn’t require painfully slow fill rates. If you’re a pool service pro doing plaster startups, refills, or builder handoffs, this is the risk management side of water chemistry. 

We also lay out a clear “trifecta” startup workflow: filter the fill water, use a startup treatment designed to manage plaster dust while supporting balance, then keep metals from turning into stains with ongoing capture. The goal is simple: protect the surface, get to clean and stable water faster, and reduce the surprises that cost you time and trust. Subscribe for more pool startup and water chemistry strategies, share this with a tech who’s fighting stains, and leave a review with your toughest fill-water question.

We break down why fill water can make or break a pool startup, especially when metals, tannins, and other contaminants are hiding in plain sight. We walk through how to test source water, choose filtration that actually matches the problem, and use a simple three-step process to protect the finish and prevent stains.  
• why startups feel risky and why fill water is a root cause  
• what to test for in fill water: inorganics and organics  
• how city water can carry oxidized metal particulates  
• why well water can contain both dissolved and solid metals  
• limitations of size-only pre-filters and when they fall short  
• where carbon helps most: tannins and organic contaminants  
• why throttling flow is a problem during a pool fill  
• how a two-stage system targets dissolved metals and organics  
• when a four-stage setup makes sense for tougher water  
• why some “city” supplies are still well water  
• the three-part startup trifecta: filter, Super Startup, Culator 4.0  
• how plaster dust can be converted to support water balance  
• why sequestration still matters even with filtered source water  
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