Don't use Format->Layer Tools->Layer Delete on any of Hydratec's stuff. I fact, I don't recommend using it in architect stuff, either. Here's why - besides deleting everything on the selected layer and the layer name itself, it also redefines all blocks that have a foot in that layer and remove those parts that do.
An example is one of our pipe sizes. If you were to select on when using this command, you would be notified thusly:
******** WARNING ********
There are 4 block definition(s) which reference the layer(s) you are deleting.
The block(s) will be redefined and the entities referencing the layer(s)
will be removed from the block definition(s).
You are about to delete layer "SPRKDATA" from this drawing.
Do you wish to continue? [Yes/No] <No>:
So, this not only gets rid of everything on SPRKDATA, it also redefines the PIPEX block and removes all the attributes that refer to SPRKDATA, in short - the Length and Diameter. The only fix (if it is too late to UNDO) is to start a new drawing and insert this drawing into it
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