Quarterly Maintenance Package
Quarterly Maintenance Package
Quarterly Maintenance Package
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Quarterly Maintenance Package



NOTE: This package only works with The Cold Stoic Classic, The Cold Stoic 2.0, and The Siberian.  For the Cold Stoic 3.0, use the Cold Stoic 3.0 Quarterly Maintenance Package.

Everything you need for 3 months of water purification.

  • Three RENU certified filters
  • Two Earth-friendly oil and dirt buoy
  • One Chlorine-Free, Eco-friendly sanitizer stick


Instructions for use & Supplemental Video

Filter Cartridges

  • Our filters generally last between 2 to 6 weeks for residential use. However, the lifespan can vary depending on local water quality and usage. To extend the life of your filter, avoid contamination from sweat, dirt, sunscreen, body oil, and other impurities.
  • The Quarterly Maintenance Package typically lasts up to 3 months. However, this duration can vary by the factors mentioned above.

Spa Dirt & Oil Remover Buoy

  • Removes the water foam and oil slicks from the surface of your Cold Plunge Tank without adding chemicals!
  • Let the buoy float in your Cold Plunge Tank
  • Leave in or remove while you’re using your Cold Plunge Tank
  • Toss and replace at 6 weeks

Spa Sanitizer Mineral Stick

  • Chlorine eco-friendly way to keep your Cold Plunge Tank free from harmful bacteria and reduces the need for harsh chemicals; less skin irritation
  • Allow the sanitizer stick to stay on the bottom for the duration of 3 months.

Video Instructions


Customer Reviews

Based on 15 reviews
Neil Sazant (Miami Beach, US)


Robert Campana (Bay Village, US)
Qrtly Maintenace Package

It great. It should be provided with the sale of the Cold Plunge instead of having to order it separately as we had to. Love Love Love our Cold Plunge. My wife is an unexpected BELIEVER 🥳

Santiago Arana (Los Angeles, US)
You guys rock!

I love everything about this company and the plunge.

John Beard (Altamonte Springs, US)
Renu Therapy quarterly maintenance great

You don’t have to think. They just send it. I use my reminders app to schedule my replacements. Only complaint is the mailing time.


So sorry you haven't been receiving your packages promptly. I will look into it to see why so that I can make sure it's not a problem in the future. However, for the hassle, I have processed a full refund for your last package. Hope that helps a little.


Jeff Allen (Timnath, US)

Quarterly Maintenance Package

Katie Kaiser (Novato, US)
super helpful

when i receive the box i write dates on each item with a sticky note for when i need to swap it out. love the convenience of having it all on hand when i need it to keep my Renu clean and working perfectly!

Scott Hutcheon (Laguna Beach, US)
Cold Plunge Success

We love our cold plunge unit from Renu. Our whole family uses it everyday. The maintenance package is key to the success of the cold plunge. Keeping it clean with ease is really important for us and this package is great.

Bill Wolfe (Ashburn, US)

Like clockwork…delivered on time..just as promised!

James Axtell (Denton, US)

Unit working very well! Thank you for an incredible product

Barry Crum (Pikeville, US)

Awesome product . Love it