The RV fresh water tank sanitizer category is cluttered with products making similar claims. Most work — the differences are in convenience, residual taste, cost per use, and suitability for different tank sizes and sanitizing frequencies. Here's a no-nonsense breakdown of the products worth buying and the ones you can skip.
Our Top Picks
Side-by-Side Comparison
| Product | Type | Cost / Treatment | Residual Taste | Works Without Flushing? | Shelf Life |
|---|---|---|---|---|---|
| Camco TastePURE (#40207) | Liquid cleaner/deodorizer | ~$10–$15 | None | No — rinse thoroughly | 2+ years sealed |
| Happy Campers | Enzyme powder | ~$0.30–$0.45 | None | Low residual OK | 5+ years |
| Bleach (Clorox) | Chlorine | ~$0.25–$0.50 | Slight if not flushed | No — must flush thoroughly | 1 year (opened) |
| Star Brite Tablets | Chlorine tablet | ~$1–$1.50 | Slight if not flushed | No — must flush thoroughly | 3+ years sealed |
| Thetford #36662 | 2-step cleaner + sanitizer | ~$14 per 24 oz | None | No — rinse thoroughly | 2+ years sealed |
Which One Should You Buy?
If you sanitize twice a year and want the easiest possible process: Camco TastePURE (#40207). Liquid cleaner and deodorizer — add to the tank, circulate through all lines, rinse thoroughly. No chlorine, widely available at Camping World and Amazon.
If you're a full-timer or frequent sanitizer: Happy Campers. At $0.30–$0.45 per treatment on a 64-treatment jar, it's the lowest cost commercial option. It also doubles as a holding tank treatment, so one product handles your fresh and black/gray tank maintenance.
If cost is the only consideration: Bleach. Buy a gallon of unscented Clorox at any grocery store for $4–$6 and use the correct dose (1/4 cup per 15 gallons). It's identical in effectiveness to any commercial product. The tradeoff is that thorough flushing is essential to avoid residual chlorine taste.
If you have a very large tank (100+ gallons) and want pre-measured convenience: Star Brite tablets (one per 100 gallons) or scale Camco TastePURE proportionally. Happy Campers powder also scales cleanly.
What to Avoid
- Scented bleach of any kind — the fragrance compounds bind to tank walls and are nearly impossible to flush out. Unscented only.
- Automotive RV antifreeze repurposed as sanitizer — it isn't one. Antifreeze protects against freezing; it doesn't sanitize bacteria.
- Unknown "sanitizer" products from no-name brands — stick to brands with published active ingredient information (hydrogen peroxide concentration, sodium hypochlorite percentage, etc.).
- Vinegar — some sources recommend white vinegar for deodorizing. It helps with mineral buildup and mild odor but does not sanitize. Don't use it as a bleach replacement for actual sanitizing.
Frequently Asked Questions
Technically yes — pool shock (calcium hypochlorite) is a chlorine-based sanitizer. However, pool shock has a higher chlorine concentration than household bleach, requires very precise dosing, and the calcium hypochlorite formulation can leave residue. Unscented bleach is easier to dose correctly and safer for this application. If you use pool shock, use only pure calcium hypochlorite without algaecide additives, and reduce the quantity significantly vs. bleach.
Signs you need to sanitize: any off taste or smell in the water, visible discoloration when you look through the fill lid, the tank has sat unused for 30+ days, you filled from a questionable water source, or it's been more than 6 months since your last sanitize. When in doubt, sanitize — it takes an afternoon and costs under $5.
TastePURE (#40207) is a cleaner and deodorizer for fresh water systems — it removes residue, buildup, and odors but is not a bactericidal sanitizer on its own. For full sanitization, follow up with a bleach soak or use Happy Campers. It does not filter particulates. For filtration, you need a separate inline water filter (Camco also makes these). Most RVers use both: sanitize the tank seasonally, and run water through an inline carbon filter for daily taste improvement.