Cryptic H20

[Quaid]

Make sparkling water every second flow (6)

 

[Quaid]

Hint: 'water' is fodder for somethin'.

 

[Quaid]

anything to do with "hoo" (h2o) ?

No, but I like that!

Hint2: 2 'e's

 

[Quaid]

"sparkling" related to sparkling wine?

Not necessarily wine, but could be. Could be related to yer fish tank, too.

Or is [sparkling] an indicator?

No, but 'every second' is.

 

[Quaid]

The original clue is too hard; the trade lingo not common enough, I suppose.

Here's a reclue:

Make sparkling water using even tempo (6)

 

[Quaid]

Make sparkling = direct

water = AE (fodder)

using even = even-letters-only indicator

tempo = RATE

Answer = AERATE


(Note: within science and medicine, 'flow' is understood as 'rate', in various circumstances, yet this lingo is not common knowledge.)