Nature² Natural Spa Purifier for Cartridge Filters

Nature² Natural Spa Purifier

Out Of Stock! 

Nature² SPA Purifiers work with your existing cartridge filter to give you clean, clear water without high levels of chlorine.

Nature² SPA is perfect for hot tub and spa owners looking for an effective and environmentally safe alternative to heavy dosages of chlorine or bromine.

Just drop the Nature2 SPA stick into the spa's filter and forget about it for up to four months! Nature2 SPA will keep your spa sparkling clean and smelling great!

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Filter Cartridge Cleaning Process

Cleaning Instructions for Unicel Spa Filter Cartridges Filter Cartridge Cleaning Process 1.    Remove the cartridge from the filter housing following the manufacturer’s instructions. 2.    Use a garden hose with a straight flow nozzle to wash down the filter element. Work from the bottom down, holding the nozzle at a 45-degree angle, and wash all the … Continue reading “Filter Cartridge Cleaning Process”

Filter Cartridge Replacements by Unicel

The Leader in Filter Cartridge Replacements

Roberts Hot Tubs carries a full line of Unicel brand filter cartridges for hot tubs.  Unicel is the standard cartridge for many hot tub, spa and filter manufacturers and is considered one of the finest cartridges made.

Why Unicel?

  • Unicel Filters are made of Reemay Media
  • Made with Spun-Bonded, 100% Polyester Material
  • Durable and Effective in Capturing the Smallest Debris.
  • Maintains Clear & Clean Water
  • Built to OEM Original Specifications
  • Reliable & Fits Your Filter Perfectly Every Time
  • Easy to Install & Easy to Replace
  • High Quality & High Customer Satisfaction Rates

Filter Replacement Cartridges Range from $16.99 – $129.95
(Choose an Option)

Rendezvous Protect Plus

Protects Hot Tub & Spa Staining & Scaling

Rendezvous Protect Plus is used to protect your spa or hot tub water from staining & scaling and helps brighten water by removing excess minerals.

Protect Plus economically & effectively binds up heavy metals & minerals that stain spa surfaces or scale up spa & hot tub equipment such as heaters & filters. No mixing, just pour it in.

Spa Frog Spa Filter Mineral Cartridge

Spa Frog Gives You Softer, Safer & Sparkling Clear Water

Spa Frog Filter Mineral Cartridges use a unique blend of minerals that work together to make your spa or hot tub water softer, safer and sparkling clear.

They fit neatly inside your hot tub or spa filter, are easy to install, don't require batteries and come with an easy-to-set dial to remind you when they need replacing.

With just a little chemical support, the Spa Frog Filter Mineral Cartridge will eliminate smelly fumes, stop skin irritation and help keep your swimming suits from bleaching out.


Rendezvous Filter Fresh for Spas

Effectively Removes Grease, Oils & Lotions from Your Filter

Rendezvous Filter Fresh for Spas is a liquid formulation of grease-cutting compounds and other ingredients designed to remove body oils, suntan lotion, grease and other organic material from your filter media.

Filter Fresh also removes scale and mineral buildup from your filter media. It is safe for use on all types of filters and Rendezvous Filter Fresh for Spas has been proven to improve the effectiveness of hot tub and spa filters.