PH and Total Alkalinity

[Watermom]

You can just aim the return jets upward to create a lot of bubbling/splashing at the surface or anything that creates a lot of bubbling.

Watermom

[CarlD]

A half a dozen pre-teen boys works very well!

There's also a fountain, for about $20, that screws into your return--that works EXTREMELY well.

[Bosch232]

I use a pvc pipe with a 45 elbow and shoot it above the surface. I put a few wraps of duct tape on the end so it fits snug in the outlet jet. Total length is about 18". Running it like this overnight will take my 16x32 from 7.3 to 7.8 overnight.