Hot Tub Maintenance Guide – Chemicals, Filters & Weekly Care

A hot tub that’s properly maintained stays crystal clear, safe, and efficient for 15–20+ years. Neglected, it becomes an expensive problem. The good news: once you understand the routine, maintenance takes about 15–20 minutes per week. This guide covers everything — water chemistry, filters, covers, seasonal care, and when to call a professional.

If your hot tub needs service right now, Spas and More’s repair team covers all of East Tennessee. Call 423-337-1859. And if you’re still shopping, visit our Hot Tubs Chattanooga TN page.

Understanding Hot Tub Water Chemistry

Proper water chemistry does three things: keeps water safe for soaking, protects equipment from corrosion and scaling, and keeps water clear. There are four parameters you need to manage:

1. Sanitizer Level

Sanitizer kills bacteria and pathogens. Your two main options:

• Chlorine: Most common. Fast-acting. Target: 3–5 ppm. Can cause mild irritation if levels spike.
• Bromine: More stable in warm water, gentler on skin. Target: 3–5 ppm. Slightly higher cost than chlorine.
• Salt systems: Generate their own chlorine via electrolysis. Softer water feel, higher upfront cost, lower ongoing chemical spend.

2. pH Level

Target: 7.4 – 7.6. This is the most important parameter to maintain consistently. Low pH (acidic) corrodes equipment and irritates skin. High pH (alkaline) causes cloudy water and scaling. Test and adjust first before adding sanitizer.

3. Total Alkalinity (TA)

Target: 80 – 120 ppm. TA acts as a pH buffer — keeping it in range prevents wild pH swings. Adjust with sodium bicarbonate (raise) or muriatic acid (lower).

4. Calcium Hardness

Target: 150 – 250 ppm. Too low: water becomes aggressive and etches surfaces. Too high: scaling on jets and shell. Chattanooga’s water supply is moderately soft — most users need to add a small amount of calcium hardness increaser at startup.

Weekly Maintenance Routine

Test Water (2–3x per week)

Use test strips or a liquid test kit. Check pH, sanitizer, and alkalinity. 3 minutes, no excuses. Catching chemistry drift early prevents cascading problems.

Add Sanitizer

Add chlorine or bromine based on your test results. After heavy use or parties, shock the water to break down contaminants — use a non-chlorine shock (MPS) for same-day soaking, or a chlorine shock and wait 8–12 hours.

Rinse Filters (Monthly)

Remove your filter cartridges and rinse them with a garden hose — no soap. This removes body oils, lotion, and debris. A clean filter = clear water. During heavy use periods, rinse every 2 weeks.

Deep Clean Filters (Every 3 Months)

Soak filters overnight in a dedicated filter cleaning solution. This removes oils and mineral deposits that hosing can’t address. Rinse thoroughly before reinstalling.

Wipe the Waterline

Every 2 weeks, use a non-abrasive spa surface cleaner to wipe the waterline — this prevents the “bathtub ring” of oils and minerals that builds up at the water’s edge.

Full Drain and Refill (Every 3–4 Months)

Hot tub water accumulates dissolved solids over time — no amount of chemicals corrects this indefinitely. Every 3–4 months:

1. Turn off the hot tub
2. Use a submersible pump or the drain valve to empty the water
3. Clean the shell interior with a spa surface cleaner
4. Rinse the shell and remove all cleaner residue
5. Refill with fresh water
6. Re-balance chemistry from scratch (start with TA, then pH, then sanitizer)

Cover Care

Your cover is doing real work — protecting water quality and holding in heat. Monthly maintenance:

• Wipe top surface with a UV protectant spray — prevents sun damage and cracking
• Check foam core for waterlogging (a heavy, sagging cover is no longer insulating effectively)
• Clean underside with a diluted bleach solution to prevent mold growth

Replace covers every 5–7 years, or sooner if the foam is waterlogged.

Seasonal Notes for East Tennessee

Chattanooga’s climate is generally hot-tub-friendly year-round, but a few seasonal considerations:

• Summer: Higher bather load increases sanitizer demand. Test more frequently, add enzymes to help break down organic material.
• Winter: If going on vacation, never turn off your hot tub in freezing weather — lower temperature settings to 98°F to save energy while preventing freeze damage.
• Fall: Leaves in your tub dramatically accelerate filter fouling — increase rinse frequency during leaf season.

When to Call a Professional

DIY maintenance handles 95% of what hot tubs need. But call Spas and More’s repair team when you notice:

• Jets losing pressure consistently
• Heater failing to reach or maintain temperature
• Error codes on the control panel
• Visible leaks around equipment or shell
• Water that won’t clear despite correct chemistry

Ready to invest in a hot tub that’s built for easy maintenance? Explore our selection at Hot Tubs Chattanooga TN or call 423-337-1859.

Ready to get started? Call 423-337-1859 or Request a Free Quote today. Serving all of East Tennessee.