Using dolphin while closed


Active member
Sep 29, 2017
Somerset County NJ
I had my plaster redone this summer and when I closed a few weeks ago I was adding acid once a week or so. I drAined the pool down about 6 inches below the tile line. Are there any issues with add acid and running my dolphin once a week or every other week when acid is added to mix it up since the filter is winterized?


Mod Squad
LifeTime Supporter
Jan 17, 2012
Evans, Georgia
No don't make the poor Dolphin breath in and swallow all that acid unless you're talking about just running the Dolphin in the pool far away from the acid.

Use a little elbow grease and mix any acid or bleach additions in with a long handled pool brush or floor brush. Be very careful adding acid to a pool when you don't have an actively flowing return to move it away from the wall and floor. You might end up with acid stains if it lingers there.

Maddie :flower:


Platinum Supporter
TFP Guide
Jul 30, 2014
Monmouth County, New Jersey

If this was my pool, I would take my shop vac (I also have extensions) enough to get down 8' and place on the blower side. I would carefully lower the blower into the water, add the acid and use the blower to mix the water. This should work, but I would try it first. Do not know what type of cover you have.

The reason why I have extensions is that the mason kicked some 3/4" rocks in the pool when he poured the cement and I needed a way to grab them without diving in to really cold water. It took a while as the water filled the Rigid wet vac, but you will be using a blower sude. Hopefully you have a blower. The extension unfortunately are like $40 if I remember correctly.

The other option is to purchase a 10' - 2 inch or 1.5 inch PVC and with the use of blow thru plugs and an air compressor to move water around on the bottom of the pool.


Well-known member
May 29, 2017
kokomo IN
MY dolphin says this

Use the Pool Cleaner in the following water conditions only:
ChlorineMax 4 ppm
pH7.0 - 7.8
Temperature6 – 34°C (43-93°F)
NaClMaximum = 5000 ppm