EXHIBIT 99.1

OSMONICS, INC. AND SUBSIDIARIES

VALUATION AND QUALIFYING ACCOUNTS

(In thousands)

Years Ended December 31, 2001, 2000 and 1999

Column A	Column B		Column C			Column D			Column E
			Additions
Description	Balance at Beginning of Period		Charged to Cost and Expensed		Charged to Other Accounts	Deductions			Balance at End of Period
Year Ended December 31, 2001:
Current Operations:
Allowance for Doubtful Accounts	$	1,008	$	525		$	570	(A)	$	963
Warranty and Start-up Reserve	$	2,222	$	2,484		$	2,510	(B)	$	2,196
Year Ended December 31, 2000:
Current Operations:
Allowance for Doubtful Accounts	$	1,315	$	746		$	1,053	(A)	$	1,008
Warranty and Start-up Reserve	$	1,936	$	2,697		$	2,411	(B)	$	2,222
Year Ended December 31, 1999:
Current Operations:
Allowance for Doubtful Accounts	$	1,057	$	762		$	504	(A)	$	1,315
Warranty and Start-up Reserve	$	2,098	$	2,052		$	2,214	(B)	$	1,936

(A)     Uncollectible accounts charged against allowance.

(B)      Actual warranty claims and start-up costs charged against reserve.

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