Pool Surface Problems I’ve Seen Over the Years

Pool surface problems are some of the most common and most misunderstood issues in pool service, especially when you’re dealing with multiple pool finish types like plaster pools, Pebble Tec pools, fiberglass pools, and vinyl liner pools. A finish can look “fine” from the deck and still hide costly defects that show up once brushing starts, chemistry drifts, or equipment finally runs. Knowing what’s cosmetic versus what signals a bigger repair helps homeowners avoid bad fixes and helps pool pros set expectations. When you learn the typical patterns of discoloration, chipping, calcium scale, and metal staining, you can diagnose faster, protect your reputation, and recommend the right long-term solution instead of a quick cover-up that fails later.

One of the biggest temptations with a worn plaster pool is pool paint. Painting a pool can be a real short-term facelift, especially when a home is being sold and the plaster discoloration is obvious. But epoxy pool paint is only as good as the prep: deep cleaning, pressure washing, fully drying, and proper primer or primer-and-paint systems. Skip steps and you’ll see blistering and peeling, often on steps or poorly prepped areas. Even when it’s done well, the lifespan is limited, commonly around five years, and repainting is harder because old epoxy must be removed first. As paint degrades, brushing can create cloudy water and chalky residue that loads the filter. The result is a pool that looked perfect at refill, then becomes a maintenance headache. Replastering is the more permanent fix when budget and timing allow.

Plaster pool defects also show up as chips, cracks, and stubborn rust stains. Chipping often starts on step edges where troweling is tricky, and it can also appear in the deep end near fittings. Small chips are usually cosmetic, but severe flaking means the surface is at end-of-life. Rust stains can come from metal objects left on the floor, from screws in toys, or from chemical damage like a trichlor tablet that sits and burns the plaster, leaving a half-moon mark that may never fully come out. For pool service bids, a practical best practice is a walkaround checklist: document chips, cracks, and any stain that looks permanent so you’re not blamed later. Also watch for “stains” that are actually rebar bleed-through. Those often look like penny-colored spots that can be slightly raised. No topical treatment fixes that; the repair is cutting and patching the area.

Pebble Tec and other exposed aggregate finishes have their own patterns. The most common is calcium buildup that creates a foggy, dull look across the pebbles, especially on lighter colors. Even with balanced water and careful LSI management, scale can still develop over years. Targeted products and ongoing maintenance can help, but aggressive scale often requires dedicated brushing, sometimes with a steel brush where appropriate for the finish and manufacturer guidance. Another issue is rust spotting from metal-containing pebbles that slip through sorting and appear months to a couple years after installation. Those spots typically aren’t treatable with chemistry. The real fix is a warranty or builder service call where a tech chips out the offending pebble, and the rust “vanishes” because the source is removed.

Fiberglass pools and vinyl liner pools are especially sensitive to staining and surface damage. With some fiberglass pools, brushing can release white powder as the gel coat oxidizes and wears away, similar to the dusty residue seen in deteriorating painted pools. Once the gel coat thins, cracking can follow, and the long-term solution is a professional re-gelcoat or resurfacing process. Fiberglass can also stain easily from metal, and many builders discourage or void warranty coverage if trichlor tablets are used because a dropped tab can discolor the surface quickly. Vinyl liners are even less forgiving: trichlor, cal-hypo, granular stabilizer (cyanuric acid), and metal objects can all leave visible stains that are difficult or impossible to reverse. The best strategy is prevention: use appropriate chemical delivery methods, keep solids from sitting on the floor, and educate customers that “just toss it in” can permanently mark their pool finish.