System Sizing for Spas (Continued)
NOTE: The EcoClean unit is designed to provide a chlorine/bromine residual whenever the spa IS NOT
in use. With an average residential spa, this “non-use” time represents 95% to 99% of each day.
Supplemental sanitizer/oxidizer should be added before and/or after EACH spa use, to maintain a 3-5
ppm of free available chlorine/bromine.
Section 1 a
2. Sanitizer Production/ System Sizing/ "Rules of Thumb"
While sanitizer
demand varies beyond precise prediction, and you may desire a higher or lower
sanitizer residual in your spa, the following "rules of thumb" will assist you in properly selecting
the correct EcoClean feed rate dial setting.
1. An EcoClean power supply with cell , operated at maximum output (100%), at 3000 ppm salt
residual will produce 15 grams of free available chlorine in 24 hours of continuous operation.
This amount of chlorine could satisfy up to 1,500 L (400 U.S. gallons) of spa water,
depending on the 8 demand variables for sanitizer.
NOTE: Residual salt levels must be maintained above 2800 ppm and below 3200 ppm. Do not
exceed 3200 ppm salt residual if you object to salty tasting water!
Normal System Sizing Guide
The sizing criteria below reflects "
normal" conditions based on field experience and proper
operation.
Sanitizing "demand" varies from one spa to another.
The chart below
provides approximate feed rate dial settings required to maintain adequate chlorine (3.0 – 5.0
ppm) or bromine residuals (3.0 – 5.0 ppm) during “non-use” periods, based on spa volume.
For proper sanitation, spa must be completely drained periodically. The number of days between
COMPLETE SPA DRAINAGE is equal to the volume of spa water in litres, divided by 10 times the
maximum number of daily spa users. Refill spa with water and repeat the start-up procedure.
Approximate
Feed Rate Dial
Settings
100%
75%
50%
25%
Litres
375
750 1125
1500
100
200 300
400
SPA SIZE
Gallons
4
