In hot tubs, **Total Dissolved Solids (TDS)** refers to the concentration of all dissolved substances in the water, including minerals, salts, chemicals, and organic matter from users. Over time, these substances accumulate as water evaporates and as bathers add contaminants like body oils, sweat, cosmetics, and lotions. High TDS levels can impact water quality, clarity, and overall comfort, leading to issues like foamy or cloudy water, as well as reducing the effectiveness of sanitising chemicals.
### Why TDS Matters in Hot Tubs
1. **Reduced Sanitiser Effectiveness:** High TDS levels can interfere with chlorine or bromine, making it harder for these sanitisers to work effectively.
2. **Water Balance Issues:** Excessive TDS can alter the waters pH and alkalinity, leading to issues such as scaling or corrosion.
3. **Increased Foaming and Cloudiness:** High TDS contributes to the build-up of foam and cloudiness, particularly noticeable when jets are running.
4. **Unpleasant Odours and Irritation:** High levels of TDS can lead to a stale, unpleasant smell and may irritate the skin and eyes.
### Managing TDS in Hot Tubs
– **Regular Water Changes:** Since TDS levels increase over time and are not easily removed, regular draining and refilling are the most effective ways to reset TDS levels. For typical usage, water changes every 2-3 months are recommended.
– **Shock Dosing:** Regular shock treatments help break down organic contaminants before they contribute to TDS levels, helping to maintain clarity and sanitiser effectiveness.
– **Testing and Monitoring:** While specific TDS test strips or meters are available, monitoring water quality and regularly checking pH and alkalinity are often adequate indicators of TDS-related issues.
By managing TDS, hot tub owners can maintain clear, fresh water and avoid common problems associated with excessive dissolved solids.
