Moving requires additional expenses for them and money upfront for deposits and even commissions. 

Seems like it's a security deposit for the homeowner's insurance. 

They paid extra deposit because of their dog, and the 1st months rent.  

I told them I would require a higher security deposit from them which she agreed too.

@Chris Seveney it gets confusing with Quickbooks because trying to follow checkbook along with when the bank records deposits at end of year or into next.

All ours are direct deposit so they vary but nothing consistent or intentional & if they are late they also pay the late fee.

How 'bout I give you your entire deposit back and pay for your first month's rent at your new place?"

The only issue is they would like a pretty high earnest money deposit that I do not have.

I think it stands to reason (short of data) it ought to be easier to deposit debris with softer flushes...how much, isn't clear...I've also experienced having to flush a second time with the more "eco-friendly" toilets, so, I am still using the "moderate flush volume toilets".Bruce

If you want to set aside a certain amount of money do it by depositing it into an Escrow Repair Equity  Account in QuickBooks.