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Rob from Las Vegas writes

Can I add 1once of Onslaught FastCap to my 1 gallon Ortho Home Defense?

I just got my order of Onslaught FastCap and I have an unused 1 gallon of Ortho Home Defense. Can I add an once of FastCap to the Ortho so I can use the Ortho as my sprayer? I find 3-5 bark scorpions per night outside and my and my sprayer broke. I need to kill them every night or they get into my house.


No, we do not recommend mixing Onslaught FastCap with Ortho Home Defense as the products are not labeled to be mixed and that would cause them to not work effectively and possibly be dangerous. Also, we would not recommend using mixed Onslaught FastCap solution in an old Ortho Home Defense bottle. It is not legal to refill a labeled bottle with another product.

Answer last updated on: 03/09/2021

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