I have a 30A GE GFIC breaker installed along with a 20A GE GFIC in my Hot Tub breaker panel. The 30A keeps shutting down the system. Tested all voltage and amp draw thested for shorts etc. Disconnected heater and pump plugs at hot tub still pops. Since these list for $200.00+ each I decided to try a non GFI 30 amp breaker for $8. It has been working fine for 3 days. Is this unsafe? The 20A states to connect tub GFI wire to itself, so if it pops it seems the tub power will shut off. Can GFI breakers be rebuilt at a lower cost? Thanks

What you have done is absolutely unsafe.

GFCIs are designed to trip the breaker if it senses a ground fault of about 6 milliamps or larger.

6 milliamps is the 'let go' current at which muscles might not respond to 'let go' and current as low as 20 milliamps can kill you.

You cannot test for such small current leaks with most homeowner electrical testing equipment.

Replacing a GFCI breaker with a standard breaker does not get rid of the ground fault condition that exists, it simply masks the condition.

If the GFCI breaker keeps breaking while a standard breaker does not, there is a good chance you have a ground fault condition in your spa or the breaker has failed.

The real question is:

Is your or a family member's life worth $200 for a new breaker or $100 for a service call from a professional electrucian to diagnose the problem correctly?

If you wait to see if the 30amp standard breaker is OK and you do have a ground fault, you'll be dead before you ever find out.

PS. You cannot rebuild GFCI breakers, they need to be replaced.

The OP's post is confusing and doesn't make a lot of sense.
Can't tell if this is new install?
Can't tell where the GFCI really is (main panel, spa panel)?
Can't tell if this is 3 or 4 wire spa?
With 3 or 4 wire feed?

What I can say is, the GFCI breaker must have the pigtail connected. This is line neutral. Load neutral is optional.

A 4 wire feed would be required if the 240 GFCI breaker is at the outdoor SPA panel even if the SPA is 3 wire.

This is a Watkins product that uses two separate GFCI breakers. The 30a feeds the heater.

Before thinking the GFI Breaker is bad, remove wiring from the load side and if it doesn't trip, it may be OK and you need to correct the Fault. Hook up load 1 at a time and see which trips it.