Henrys514
06-12-2006, 12:24 AM
This is a question about Calcium Hardness...Pool info: 12,000gal IG exposed-aggregate surface.
Pool store test says hardness is 185ppm. My Wal-Mart test taken on the same day says 0ppm (I think. It says to add two drops of this reagent, and if hardness is present, water will turn a violet color. There was no color change, so I assumed hardness was not present)
I tested my fill water, to make sure the reagents were working, and the result was 200ppm.
Is there a Method Detection Limit for the Wal Mart Hardness test, so my number may not be 0ppm, it may just be below the ability of the test to detect? Should I add indicator until I get a violet color, then adjust the amount of titrant added accordingly?
I need to add hardness either way, so I'm planning on adding 8lbs of Calcium Chloride (i think that's what the ingredient is) tomorrow evening. According to the bucket, that should increase my hardness by ~55ppm. 55ppm increase is great if my hardness is 185ppm. If it's really 0ppm, it's not nearly enough.
Another question...it's supposed to rain here Monday and Tuesday...a lot (darn tropical storm:mad: ) Should I wait to add the calcium chloride until Wed? The hardness has been low for a while now...we battled algae for a while, now that the water is clear we need to get everything else in line.
Pool store test says hardness is 185ppm. My Wal-Mart test taken on the same day says 0ppm (I think. It says to add two drops of this reagent, and if hardness is present, water will turn a violet color. There was no color change, so I assumed hardness was not present)
I tested my fill water, to make sure the reagents were working, and the result was 200ppm.
Is there a Method Detection Limit for the Wal Mart Hardness test, so my number may not be 0ppm, it may just be below the ability of the test to detect? Should I add indicator until I get a violet color, then adjust the amount of titrant added accordingly?
I need to add hardness either way, so I'm planning on adding 8lbs of Calcium Chloride (i think that's what the ingredient is) tomorrow evening. According to the bucket, that should increase my hardness by ~55ppm. 55ppm increase is great if my hardness is 185ppm. If it's really 0ppm, it's not nearly enough.
Another question...it's supposed to rain here Monday and Tuesday...a lot (darn tropical storm:mad: ) Should I wait to add the calcium chloride until Wed? The hardness has been low for a while now...we battled algae for a while, now that the water is clear we need to get everything else in line.