either sintered glass (and use muriatic acid to clean them frequently) or
how about soaker hose? Ingrid


"BoyPete" wrote in message
...
Supplemental question........... any reccomendations for airstones (in UK)
please. I live in a hard water area, and they clog in a few weeks.

Here's the solution I use for putting oxygen in my pond.
The venturi makes very fine bubbles. No airstone or second pump needed.

http://i83.photobucket.com/albums/j2...ak/triffet.jpg

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