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When it comes to hot tubs, it is important to regularly check the pH balance, add shock treatments, and periodically empty and scrub down the interior. 

Yet, even with all that, sometimes the hot tub water no longer stays crystal clear. That is because undesirable contaminants have been building up unseen over time. This is when a deep cleanse is needed. Yes, even in Bullfrog Spas which boast 90 percent less of this equipment.

Serum Water Care Purge at Work

Serum Water Care Purge at Work

“The problem with this type of build up,” says Bill Renter, owner of Best Hot Tubs, “is the pollutants that pass through and collect in the pipes get trapped there by organic scum that shields it from the bromine and chlorine sanitizers we use to clean the water. This means that even though we use chemicals to keep the water clean, the insides, or guts, of the hot tub are not getting cleaned out of undesirable contaminants. This can eventually cause problems for hot tub users.”

For this reason, Best Hot Tubs recommends that whenever it’s time for a water change, before you drain, scrub and refill the hot tub, to use a special serum regimen — Hot Tub Serum: Total Clean WaterCare System.

Then, after using the purge, drain the water and wipe the interior clean, removing all the organic matter residue with a sponge and hose. Once it is cleaned, refill the tub with fresh water and reset pH levels.

Best Hot Tubs maintenance techs (see below for contact info) are ready and able to handle not only the regular servicing but also this deep cleaning of your spa for you.

But if you want to handle this project on your own, we have a tip. 


Some who have used this product suggest that when refilling the hot tub, it’s wise to put a filter on the hose — or at a minimum let the hose run water for a bit so as to spill off any minerals or contaminants that have built up in the hose.

“People do not realize that a hose that lies on the ground all summer will develop a biofilm and bacteria just like a hot tub,” says the owner of the hot tub serum system, Mark Henderson.“We suggest having a clean separate hose that is kept dry indoors and used only to fill the tub.”

Bill adds that a purge should at a minimum be done every six months to remove any new build up of the biofilm. However, we even recommend doing it before every drain and fill. 

“Part one alone of our treatment system will not stop the reemergence of the unwanted organic build up. Using the maintenance part of our Serum and keeping a correct pH balance are also key,” adds Henderson. 

“I was happy to learn from the manufacturer that this Serum has received EPA approval as a biocide. EPA approvals not only mean the product isn’t dangerous, but that it works just like it claims to. That is comforting to know. So the result of using the Hot Tub Serum system, coupled with regular water testing and pH adjustments, will provide a cleaner and safer hot tub to truly relax in, says Renter. ”

Clean Hot Tub Water:

Clean Hot Tub Water:

This Best Hot Tubs’ Bullfrog Spa has pristine water. However, we are now learning that to achieve truly clean hot tub water, it is essential to purge out contaminants in the spa’s plumbing. The following photo shows the results of a purge of pipes and plumbing after Part One of the Hot Tub Serum system was applied.

Hot Tub Serum System at Work:

Hot Tub Serum System at Work:

After applying Part One of the Hot Tub Serum system, organic matter that has built up unseen in the pipes is purged out. It is best to use the purge each time the hot tub is drained and cleaned

The following video shows the amazing effects of a purge using this Hot Tub Serum system:


Additional Tip for Deep Hot Tub Cleaning:

Additional Tip for Deep Hot Tub Cleaning:

Be sure that you immediately drain and clean your tub after using the serum system. This ensures that the contaminants removed from the plumbing system do not stain your pristine tub.

If you have any questions about keeping your hot tub clean, you can contact us: