Introduction: To properly prep and sanitize your hot tub, you should follow a structured routine divided into a quarterly deep-clean (drain and refill) and a weekly chemical maintenance routine.
Proper preparation ensures that biofilm and hidden bacteria are flushed from the plumbing lines before you introduce fresh water and sanitizing chemicals.
Part 1: The Quarterly Prep & Deep Clean (Every 3–4 Months)
Before you can properly sanitize the water, you must clean the physical environment where it sits.
- Flush the Lines: Before turning off the power or draining the water, add a specialized line flush cleaner to the old water. Run the jets on high for 20–30 minutes to purge hidden bacteria, body oils, and biofilm from the internal pipes.
- Power Down: Turn off the hot tub at the main circuit breaker to ensure total safety while working near empty components.
- Drain the Tub: Attach a garden hose to the drain valve or use a submersible sump pump to empty the water completely.
- Clean the Shell: Wipe down the interior acrylic surface using a damp cloth and a designated, spa-safe surface cleaner.
- Safety Note: Never use household bleach or abrasive kitchen cleaners, as they can permanently ruin the shell and throw off your future water chemistry.
- Clean the Filters: Remove the filter cartridges. Spray them down thoroughly with a garden hose to remove loose debris. For a deep clean, soak them overnight in a dedicated filter cleaning solution, then rinse and let them dry.
- Refill via the Filter Well: Place your garden hose down into the primary filter compartment rather than dropping it directly into the footwell. This forces air out of the plumbing lines and prevents an “airlock” when you turn the power back on. Fill until the water covers the top jets.
- Power Up & Heat: Replace the clean filters, turn the circuit breaker back on, and let the water heat up to around 80°F before starting the sanitation process.
Part 2: Balancing & Sanitizing (New Water or Weekly Maintenance)
Water sanitation only works effectively if the water is balanced first. Always add your chemicals in this exact order, waiting about 20 minutes with the jets running and the cover off between each addition:
| Step | Component | Target Level | Why It Matters / How to Fix |
|---|---|---|---|
| 1 | Total Alkalinity (TA) | 80 – 120 ppm | Acts as a shield for your pH. Adjust this first using an alkalinity increaser or decreaser. |
| 2 | pH Level | 7.2 – 7.6 | If pH is too high or low, your sanitizer won’t kill bacteria efficiently. Adjust with pH Up or pH Down. |
| 3 | Sanitizer | 2 – 4 ppm (Chlorine) 3 – 5 ppm (Bromine) | Kills pathogens and algae. Add chlorine granules directly, or use bromine tablets in a floating dispenser. |
| 4 | Shock (Oxidizer) | Weekly dose | Burns off organic matter like sweat and body oils, removing odors and regenerating spent sanitizer. |