Good morning. I have some yellow mustard algae. Vacuumed , brushed, scrubbed, repeat. Difficult to eradicate. Raised the CL to 30, not maintaining on OCLTs, drops to 22. Due to heavy rains and storms, hadn’t checked in a day. Dropped to 17, and maintains at that. Water clear, no sign of algae..yet. So, according to my (original) instructions on the DPD/FAS, I can further test at 25 ml with 1 heaping scoop, then multiply by .2. Tried with 2 level scoops DPD powder on both 10ml and 25 ml. Getting very different readings. Cl today 17, and 14.8 respectively. Prior to SLAM, readings were approximately CL 6, CC 0, pH 7.6, TA 100, CH 100, CYA 45, Borates 35, water temp. 82°. These readings were with the 10 ml. So which CL reading do I go by? I use Pool Math. Thank you!
Chlorine tests
- Thread starter Gardenmom
- Start date
ONE level scoop is all you need. Any more is wasting it and costing you money. And the 10ml water sample where 2 drops = 1 FC is close enough for our needs.
Oops, FC not CL! My directions are old, 1 heaping scoop, printed by the manufacturer, hmmm. I agree, one level is sufficient. And I divide the drops in half to get FC reading. Math is not my strong suit. Thank goodness for Pool Math! I’ll again try to get FC to 30. Used a ton of liquid chlorine, and way too much reagents. Thank you so much!