We are going to soak our SWG cell in muriatic acid to clean it (and hope it fixes it). But once it's done soaking, how do we dispose of the acid? Also, Hubby wants to soad it over night, will that be too long?

You're only talking about a small amount, right? Why not just pour it in the pool?

Well we were planning to submerge it in acid so depending on the size of the container we find to soak the cell in, it would probably be more than we usually put in to lower the pH and if it's cleaning stuff off of the cell, not sure I want dirty acid poured in my pool, do I?

Well then, you could use it to scrub stained concrete, the driveway, perhaps? Or just neutralize it with baking soda (watch out for violent foaming) and pour it on some weeds or down the drain.

violent foaming. lol sounds like a fun chemistry experiment...haha

Baking soda is the best approach: add baking soda fairly slowly until it stops foaming up, then pour down the drain with the water running.

Pouring it back into the pool adds calcium back to the pool, which could be a annoying in some situations.

A lot of the acid's initial power will be neutralised by cleaning the calcium and other deposits off the plates in the cell. Put it down the toilet and let is descale that too.

I always pour mine over the fence in the neighbors flower bed JK!

You do know that you only put the acid INSIDE the cell, don't soak the whole thing; the outside should not get acid on it. Then after cleaning u should be able to dump it in the pool.

We're first year pool owners so we are not as experienced as many out there on TFP. The local pool store where we buy our acid instructed us to mix it 1 part acid to 4 parts water, then stuff a tennis ball into one end of the cell to seal that end, (or buy some special cleaning kit that caps it off) and let the solutin soak inside of the cell until the bubbles stop but not longer than 15 min. We set the whole thing in a bucket while doing this to prevent acid leaking out into the lawn.