Should I let FC get to zero before draining into yard?

Rq120

Well-known member
May 3, 2019
53
Florida
I'm having a remodel starting July 1. We will be getting new tiles, coping, pavers, and plaster. We don't have a street drain so the pool will be drained to the back of our yard where there is a greenway. Our CYA is currently 140 so I have to keep the FC levels pretty high. I don't want to kill any grass, so do I need to let my FC get to zero before draining. I'm not sure how much FC grass can tolerate.
I guess it only matters the weekend before the remodel starts because my kids swim everyday. So it's a balance of keeping the pool sanitary and not killing any grass.
 

PoolGate

Gold Supporter
TFP Guide
Jun 7, 2017
3,721
Damascus, MD
I don't I just drain away. Never drained the pool but in winter they drain 20% out. I looked up EPA regulations once just to be sure and they don't seem to care.
 

tim5055

Mod Squad
TFP Expert
LifeTime Supporter
May 11, 2014
10,328
Franklin, NC
If it's going to flow to any body of water, then yes - the lower the FC before you drain the better. There are many areas that are now starting to regulate the water drained/backwashed from pools. As an example, where I previously lived - Lexington, SC, any water drained/backwashed that was not retained on your property had to be de-chlorinated before you did it. But, to show how up on the science they are, "salt" pools were exempt form this rule. One of the city workers told me this was because "salt" pools don't really use chlorine.....
 

rajung

Well-known member
Mar 17, 2015
463
Cedar Falls, Iowa
My FC is always around 5ppm, my needed level for CYA, I use to backwash once a week or lower after heavy rain into yard, never had grass kill or even browning, actually grew better due to all the water.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
22,396
Laughlin, NV
The salt in your pool water is more of a threat to the plants than the chlorine. If you get little rain, the salt can build up and be an issue. If you gets lots of rain, it will be washed away.
 
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Rq120

Well-known member
May 3, 2019
53
Florida
Thanks everyone. From the replies I think I’ll let it come down a little, but not to zero. My goal FC with my chlorine level is 11-15 so I’ll let it come down from goal 1-2 days but not to zero.

Tim, the water will not go into another body. It will drain to the back of my yard where there is a slight ditch between our yard and an old golf tee box. But that’s an excellent consideration!
 
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