"Spa Water Mold" or White Water Mold
Spa Water Mold is a growing problem, especially in spas that are not maintained properly and/or are used infrequently.
Many of you have been asking about this problem, so here is some information about Spa Water Mold, as well as how to treat it and how to prevent it.
quick video here.
What it is & what it looks like:
a naturally occurring fungus
(this is NOT a form of Algae; it is animal not
Spa Water Mold (WWM) - along with Pink Slime -
come from Biofilms
white mucous or tissue paper-like
forms a heavy, protective coating providing the organism with an unusually high level of protection that is very resilient against halogen-based (chlorine, bromine) & non-halogen sanitizers or germicides
can remain a contaminant even after treatment
exists on the surface of PVC plastics,
inside piping, filter cartridge housings, jet nozzles, etc. If you see it
on the inside surface of your spa, it is well established in all of the plumbing
lines & air blower lines of your spa or hot tub.
can re-contaminate long after it appears that it has been destroyed (includes pool toys, floats, ladders, steps, fountains, automatic pool cleaner parts, skimmer baskets, weirs, directional fittings, garden hoses, etc.)
small quantities can lead to a re-establishment of the problem
caused by improper water & pool maintenance, environment, poor circulation
prefers areas that are "dark" (not exposed to direct sunlight) & with "slow moving" water
(behind jet nozzles, the back of the motor impeller, etc., areas that you would
think have a lot of water motion)
Prevention of "white water mold" is preferred over treatment. Follow these steps to help prevent white water mold:
1. Physically brush & clean ALL
Spa surfaces weekly, including steps, jet recesses, & behind pillows
2. Expose ALL pool surfaces to as much sunlight as possible (sunlight & UV are natural
3. Remove the lid from the skimmer to allow sunlight into the basket for several hours each day ** INGROUND POOLS MUST USE EXTREME CAUTION in doing this in order to avoid a person falling into or otherwise injuring themselves due to an open skimmer.
4. Regularly add oxidizing chemicals into the skimmer to purge & clean the filtration lines of any bio-film*
5. When adding make-up water from the garden hose, allow the water to run for 2 to 3 minutes before putting the hose into the pool.
6. Regularly clean
spa & hot tub toys & floats (use BioGuard® Stow Away)
7. Regularly clean pool solar blanket (use
BioGuard® Stow Away)
8. Chemically clean pool filter every 4 to 6 weeks (use
Filter Cleaner or
SoftSoak® Filter Cleaner)
9. Add regular Maintenance dosages of "Shock"
Brominating Concentrate or
Shock) every week as prescribed
10. Run the filter a minimum of
6 hours daily to prevent "dead spots" in the pool
11. Remember to clean & rinse the brushes, hoses & vacuums that you use to clean the
12. Leave as much of your spa equipment exposed to the sun
13. Keep the water balanced at all times. Recheck after heavy usage or rain or large "top-offs" of new water. Water balance refers to Free Available Sanitizer level, pH, Total Alkalinity, Calcium Hardness.
Products to Treat & Prevent Spa White Water Mold &
Treatment of "white water mold" MUST BE QUICK AND TOTAL! DON'T SKIMP!
1. Clean all
spa or hot tub surfaces as prescribed above.
2. Physically clean & remove all visible "white water mold"
Clean the interior of the filter cartridge area & as much of the spa
equipment pack as
4. "Shock" the pool with a triple or quadruple dose
of the proper shock treatment for your spa or hot tub.
Drain & refill the spa. Use
Flush to help remove the built-up bio-film in the lines prior to
draining. If the situation is very bad, refill the spa, shock it with
chlorine, allow to circulate for 1 day, then drain & refill again using Spa
System Flush just before draining.
6. Chemically clean the filter
Filter Cleaner or
SoftSoak® Filter Cleaner;
if the cartridge is more that 1
year old, throw it away & start fresh with a new cartridge.
Test the water & properly balance it.
8. Maintain good water balance of pH, Total Alkalinity & Calcium Hardness
For further information, please visit our
If you still need help, here's how to
store hours): Stratford 203-377-0100
FAX: (24 hrs) 203-375-7787