One of the most common decision points when specifying a pool nozzle, main drain grille or ladder is the stainless steel grade. The difference isn't a brand preference — it's a technical choice tied directly to your pool's water chemistry.
| Criteria | AISI 304 | AISI 316 |
|---|---|---|
| Composition | 18% chromium, 8% nickel | 16-18% chromium, 10-14% nickel + 2-3% molybdenum |
| Salt water / chlorinator resistance | Limited — pitting risk over the long term | High — molybdenum gives strong resistance to chloride |
| Suitability for thermal/spa water | Not recommended | Recommended |
| Price | Baseline price | Roughly 15-25% higher than 304 |
| Typical use case | Standard fresh water, chlorine-disinfected home/hotel pools | Salt water systems, thermal facilities, coastal projects |
Which one should you choose?
If your pool is filled with standard mains water and disinfected with chlorine, AISI 304 is technically and economically sufficient.
If your pool uses a salt chlorinator, thermal/spa water, or sits in a coastal environment with high salt/humidity exposure, AISI 316 should be specified instead — the higher upfront cost avoids the cost of early replacement due to corrosion.
If you're unsure, tell your project engineer or supplier your pool water's salt/chloride profile; many products across SNY Pool's range are offered in both grades as separate SKUs.
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Inlet & Vacuum Nozzles, Main Drain Grilles, Stainless Ladders, Stainless Steel Equipment