Response to Paterson tanks - capacity and agitation method?

Like Tim Brown I have been using this same tank for 20 years. I always fill to 600ccs to be safe and never invert. I only use the twizzle stick and for 10 secs every minute. I have tested the invertion method with C41 chemicals - I use Ilford XP2- and I got bubbles adhering to the test film 3 times out of 10. I have personally never had an uneven development problem using the twizzle stick.

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