If you use the LQ, do you use the SWG CYA/chlorine chart?

Bama Rambler

Mod Squad
TFP Expert
Bronze Supporter
LifeTime Supporter
Jun 22, 2009
SouthWest Alabama
I use the standard chlorine/CYA values. I'm not sure whether the SWCG does something extra or whether there just isn't enough data collected on the LQ to add it to the chart.


TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
Silver Spring, MD
You should use the regular (non-SWG) chart with the Liquidator. There isn't enough data to be totally sure, but so far nearly everyone who tried SWG FC levels with the Liquidator has had problems.


Well-known member
Jul 23, 2009
Burlington, Ontario, Canada
OK, thanks guys, I thought the SWG chart was based on the fact that the FC levels are held stable (for the most part) through the day by continuously adding chlorine to the pool, unlike the manual method of adding chlorine where it's added just once a day.

chem geek

TFP Expert
LifeTime Supporter
Mar 28, 2007
San Rafael, CA USA
The SWG chart is based on observational experience. We don't really know the true reason as to why a lower chlorine level works OK for SWG pools. Some of it may be the more consistent dosing so that it doesn't get too low but some of it may be some super-chlorination of a portion of the pool water going through the cell. I suspect it's a little bit of both though more of the latter, but to play it safe we recommend the normal dosing chart. Of course, you are free to experiment with what works in your own pool and report back to us what you find.