what other product name GDL is equivalent to?

Hello,

I tried the search function but got a ton of threads with none actually about GDL (that I could find) I got some GDL from Wiberg. I read up about cultures here and on the Wedliny Domowe page (english) It describes a lot of lactic acid cultures and their product name but I didn't see GDL? Does anyone know what other product name GDL is equivalent to? Also on the package it doesn't say how much to use. I have been using between 5-7 g/kg. I don't have a PH meter so I'm winging it. I would like to be a little more specific and not guess. Any input would be appreciated.

Please help

I didn't find the right solution from the internet.

References:
[url]http://wedlinydomowe.pl/en/viewtopic.php?p=34917[/url]
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Thank you