FAQs: Spa & Hot Tub

What UV System Series Is Best For Spas And Hot Tubs?

  • The type of spa determines which Series should be used. If the spa is a portable spa, with equipment placed under the spa skirt, then the physical size of the UV system becomes an issue. The Delta UV EA Series is perfect for placement under the skirt of the spa due to its compact physical size. However, it should be noted that while the reduced physical size limits the spa water flow rate through the EA unit, the High Output EA units allow a 69 GPM (216 LPM ) maximum flow rate. Thus, with the introduction of the High Output EA units, higher flow rates are now available then were possible when spa UV systems required a small continuous circulation pump in the spa plumbing system. If the spa is an in-ground type with the circulation equipment located separately from the spa, then either the E A-3H or EA-4H High Flow Series would likely be the perfect system for the spa. For larger in-ground spas, the E or ES Series should be considered. Remember that regardless of the Series selected, it is important to keep in mind the maximum flow rate for the UV system selected. You can obtain this flow rate information in the DOCUMENTS section of the CUSTOMER SERVICE link by viewing the Data Sheet for each Series of UV systems.


What If The Spa Has Only A 230V Power Source?

  • All Delta UV Systems are available in 110-230V (240 V 50/60 Hz) models. Consult the Data Sheet for the Series of interest, to obtain the 240V model number.


Are There Any Special Requirements When Using A Delta UV System On A Spa Or Hot Tub?

  • All Delta UV Systems are equally at home whether installed in a spa, hot tub, swimming pool, water feature, or pond. Proper sizing of the UV unit to the pump output flow rate is the only consideration besides physical size limitations (portable spas).


Will The Chlorine Use Be Reduced 70% Or More On A Spa The Same As UV Systems Installed On Pools?

  • Yes, while a Registered sanitizing chemical must be used in the spa along with the UV system (to sanitize water outside of the UV system chamber, such as in the piping etc,) the user should expect the UV system to do the main work of water bacteria sanitation and thus, reduce the need for Chlorine (or similar oxidizer). This is how UV systems are able to achieve the dramatic Chlorine use reduction that occur s after UV installation.


What Chemicals Are Introduced Into The Spa By The UV System?

  • No chemicals of any nature whatsoever are introduced into any body of water by the UV system. All UV sanitation of the spa water takes place inside the UV system’s wet chamber by the killing of the micro-organisms and bacteria that enter the UV unit. The spa itself should always have a Registered sanitizer (Chlorine, Bromine, Biguanide) in the spa water, at the minimum levels recommended by the sanitizer manufacturer, in addition to the UV system. The water entering the spa from the UV system is biologically sanitary, the water in the spa must be sanitized until it reaches the UV chamber. Organizations such as NSF recognize the roll of UV systems in spas and allow lower levels of Registered sanitizers to be maintained when a UV system is present. Just remember that the UV system imparts nothing into the spa water, so normal spa chemical balance is still required. Follow the directions supplied with your spa chemicals.