SpaGuard System Flush | Spa Plumbing Cleaner

• 1 x SpaGuard System Flush — 24 oz (one full bottle treats one hot tub)

Note: One 24 oz bottle is a single full-tub treatment — the entire bottle is added per flush. Keep the bottle tightly sealed and store in a cool, dry place; mix only with water, never with other chemicals.

• Cleans hidden plumbing buildup — removes grime, lotions, body oils, skin- and hair-care residue, and debris from inside the spa's pipes and circulation lines.
• Restores circulation efficiency — clearing the lines lets the pump and circulation system move water freely.
• Improves water condition and chemistry — eliminates the hidden contaminants that cloud fresh water and fight your sanitizer.
• Used before a drain and refill — flushes the buildup out with the old water so your fresh fill starts truly clean.
• One bottle per tub — simple, full-dose 24 oz treatment.
• Works with all systems and sizes — every sanitizer type and every spa size.

Most of a spa's water spends its life moving through plumbing you can't see. Over months of use, the oils and organic residue bathers leave behind coat the inside of those pipes and combine with bacteria to form biofilm — a slick, stubborn layer that ordinary draining never removes. Because it's sealed inside the plumbing, biofilm survives a water change and immediately starts contaminating the new water, which is why a freshly refilled spa can cloud up or smell off far sooner than it should.

SpaGuard System Flush is a concentrated plumbing cleaner. Added to the water with the pump running, it circulates through the entire system and breaks the oily buildup and biofilm loose from the pipe walls. Once it's lifted free, you drain the spa and the contaminants leave with the water — so when you refill, your plumbing is clean and your fresh water stays fresh. That clean system is what lets your circulation run efficiently and your water chemistry behave the way it's supposed to.

Pro Tip: Pair the flush with a filter cleaning for a complete reset. While the flush circulates, your dirty cartridge is part of the system — so clean or replace the filter as part of the same job (SpaGuard Filter Cleaner handles the cartridge). Flushing the plumbing but reinstalling a gunked-up filter undoes half the work.

Use prior to draining, cleaning, and refilling your spa.

1. Remove the cartridge filter and clean it with SpaGuard Filter Cleaner per its label directions (or replace it).
2. Apply the entire contents of the bottle (24 oz) directly to the spa water with the pump on.
3. Circulate the water for 15 minutes.
4. Turn the pump off and completely drain the spa water.
5. Clean the surface of your spa with a spa surface cleaner.
6. Reinsert the cleaned cartridge filter, refill the spa, balance the water, and resume use.

Pro Tip: Don't skip the drain. System Flush works by lifting buildup off the pipe walls and into the water — that loosened gunk needs to leave with the old water. Always run the flush on the water you're about to dump, never on a fresh fill you plan to keep.

• Product: SpaGuard System Flush — Spa Plumbing & Biofilm Cleaner
• Brand: SpaGuard (BioGuard family)
• SKU: 42422BIO (confirm from backend)
• Size: 24 oz (one full-tub treatment)
• Form: Liquid concentrate
• Function: Removes built-up oils, grime, residue, and biofilm from spa plumbing
• Dosage: Entire 24 oz bottle per hot tub
• When to Use: Before draining, cleaning, and refilling the spa
• Recommended Frequency: 4 times per year (with each quarterly drain and refill)
• Circulation Time: 15 minutes with the pump on, then drain
• System Compatibility: All sanitizer systems and all spa sizes
• Surface Compatibility: Safe for all common spa surfaces and plumbing
• Cautions: Mix only with water; do not mix with other chemicals in concentrated form
• Country of Origin: Made in USA
• Hazmat Classification: Non-hazardous — not DOT-regulated; ships standard and is mail-returnable

System Flush is a maintenance product that fits any spa:

• All sanitizer systems — chlorine, bromine, ozone, biguanide, and mineral systems.
• All spa sizes — one 24 oz bottle treats a standard hot tub.
• All spa surfaces and plumbing — safe for use throughout the spa's circulation system.

Important: System Flush is a pre-drain plumbing cleaner — it is not a sanitizer or water balancer, and it is used with the old water before draining, not as part of ongoing balanced water. Mix only with water.