TOTAL DISSOLVED SOLIDS (TDS) FRESH WATER STANDARD, 830 ppm / Fresh Water Ion TDS (by conductivity method), EPA/APHA 'Very Hard' Synthetic Fresh Water Formulation, Hardness 280-320 mg/L as CaCO3, Ricca
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total dissolved solids (tds) fresh water standard, 830 ppm / fresh water ion tds (by conductivity method), epa/apha 'very hard' synthetic fresh water formulation, hardness 280-320 mg/l as caco3, ricca
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TOTAL DISSOLVED SOLIDS (TDS) FRESH WATER STANDARD, 830 ppm / Fresh Water Ion TDS (by conductivity method), EPA/APHA 'Very Hard' Synthetic Fresh Water Formulation, Hardness 280-320 mg/L as CaCO3, Ricca