Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Total net revenues	$ 2,187	$ 2,736
Gross margin	1,025	1,587
Research and development expenses	578	556
Depreciation and amortization expense	52	50
Selling, general and administrative expenses	2,348	1,999
Total operating expenses	2,978	2,605
Loss from operations	(1,953)	(1,018)
Water Filtration [Member]
Segment Reporting Information [Line Items]
Total net revenues	2,159	2,736
Gross margin	1,053	1,587
Research and development expenses	255	294
Depreciation and amortization expense	51	50
Selling, general and administrative expenses	2,150	1,876
Total operating expenses	2,456	2,220
Loss from operations	(1,403)	(633)
Pathogen Detection [Member]
Segment Reporting Information [Line Items]
Total net revenues	28
Gross margin	(28)
Research and development expenses	206	119
Depreciation and amortization expense	1
Selling, general and administrative expenses	171	101
Total operating expenses	378	220
Loss from operations	(406)	(220)
Renal Products [Member]
Segment Reporting Information [Line Items]
Total net revenues
Gross margin
Research and development expenses	117	143
Depreciation and amortization expense
Selling, general and administrative expenses	27	22
Total operating expenses	144	165
Loss from operations	(144)	(165)
Consolidated [Member]
Segment Reporting Information [Line Items]
Total net revenues	2,187	2,736
Gross margin	1,025	1,587
Research and development expenses	578	556
Depreciation and amortization expense	52	50
Selling, general and administrative expenses	2,348	1,999
Total operating expenses	2,978	2,605
Loss from operations	$ (1,953)	$ (1,018)