What to use as draw wire

[Delta]

Hi guys

When doing alot of conduit in slabs, decks etc what do you use as a draw wire?

I'm talking about leaving it in the conduit after installing the conduit and fastening to housewire and pulling through when ready.

Surely buying rolls of galvanized wire is uneconomical.

Any cheaper ideas out there?

Besides fish tape.

Thanks

[Alfred M]

I don't know if you are familiar with a conduit mouse, also called a conduit piston, is a small cylinder of foam that is slightly smaller than the interior diameter of the conduit. You use it with a shop vacuum.Tie a piece of string to the piston and suck it through with a shop vac.

[GCE]

WE use baling string from BKB and a'" wire wizard" to pump it through