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A method including: sonicating a stream containing a dispersion comprised of agglomerated primary particles; and filtering the resulting sonicated stream containing a dispersion comprised of de-agglomerated primary particles. An apparatus including: an ultrasonic adapter to ultrasonicate a stream of

A method including: sonicating a stream containing a dispersion comprised of agglomerated primary particles; and filtering the resulting sonicated stream containing a dispersion comprised of de-agglomerated primary particles. An apparatus including: an ultrasonic adapter to ultrasonicate a stream of a liquid dispersion of agglomerated primary particles; and a filter member adapted to filter the resulting ultrasonicated stream containing a dispersion of de-agglomerated primary particles; and optionally a coater adapted to coat the resulting filtered stream containing a dispersion of de-agglomerated primary particles onto a receiver.

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1. A method comprising:sonicating a stream containing a dispersion comprised of agglomerated primary particles; filtering in the resulting sonicated stream containing a dispersion comprised of de-agglomerated primary particles and further comprising coating the resulting sonicated stream onto a rece

1. A method comprising:sonicating a stream containing a dispersion comprised of agglomerated primary particles; filtering in the resulting sonicated stream containing a dispersion comprised of de-agglomerated primary particles and further comprising coating the resulting sonicated stream onto a receiver surface wherein the receiver surface is a coated photoreceptor substrate and wherein the de-agglomerated primary particles are separated in the resulting sonicated stream. 2. The method in accordance with claim 1, wherein the primary particles are toner particles comprised of a mixture of at least one colorant and a resin. 3. The method in accordance with claim 1, wherein the agglomerated primary particles are present in the stream in an amount of from about 0 to about 60 weight percent based on the total weight of the stream. 4. The method in accordance with claim 1, wherein the de-agglomerated primary particles have a volume average diameter of from about 0.005 to about 20 micrometers. 5. The method in accordance with claim 1, wherein the primary particle is at least one colorant. 6. The method in accordance with claim 1, wherein the filtering removes at least one objectionable contaminant contained in the stream of de-agglomerated primary particles. 7. The method in accordance with claim 6, wherein the contaminant has an average diameter particle size greater than the average diameter of ultrasonically de-agglomerated particles. 8. The method in accordance with claim 1, wherein the stream further comprises a continuous liquid phase carrier vehicle. 9. The method in accordance with claim 1, wherein the stream further comprises a continuous gas phase carrier vehicle. 10. The method in accordance with claim 1, wherein the sonication is accomplished with at least one ultrasonic member. 11. The method in accordance with claim 1, further comprising sonicating the filter media with a second sonicator during the filtering of the sonicated stream. 12. The method in accordance with claim 1, further comprising measuring the stream pressure just prior to filtering. 13. The method in accordance with claim 1, further comprising re-agglomerated the resulting de-agglomerated primary particles. 14. The method in accordance with claim 1, further comprising analyzing the sonicated stream for third particles arising from degradation of the primary particles during sonication. 15. The method in accordance with claim 1, the stream of agglomerated or de-agglomerated particles further comprises at least one surfactant. 16. A method comprising:sonicating a stream containing a dispersion comprised of agglomerated primary particles; filtering the resulting sonicated stream containing a dispersion comprised of de-agglomerated primary particles, further comprising sonicating the filter media with a second sonicator during the filtering of the sonicated stream; and coating the resulting filtered stream containing a dispersion of de-agglomerated primary particles onto a receiver. 17. An apparatus comprising:an ultrasonicator adapted to ultrasonicate a stream of a liquid dispersion of agglomerated primary particles; a filter member adapted to filter the resulting ultrasonicated stream containing a dispersion of de-agglomerated primary particles; andfurther comprising a second ultrasonicator adapted to ultrasonicate the filter member and a coater adapted to coat the resulting filtered stream containing a dispersion of de-agglomerated primary particles onto a receiver. 18. The apparatus in accordance with claim 17, wherein the coated receiver is substantially free of agglomerated primary particles. 19. The apparatus in accordance with claim 17, wherein the second ultrasonicator ultrasonicates the filter member when the coater is inactive.