Hello All,
Just bought a house with a underground 25,000 gallon vinyl lined rectangular pool - about 15 years old. Originally was on chlorine with Tri-chlor, Sand filter, pump is single speed 1 HP and runs 24/7.
Typical readings were all within normal limits except FC and TC. A "good" reading would be FC 1.8, TC 3.4. A typical reading was FC 0.4 (or 0), TC 8.2. Tried shocking with Cal Hypo multiple times... used 25lbs several times. Had no luck and decided it might be the filter and sand. Also had pump problems, so decided since we needed to replace pump and filter, might as well covert to a SWCG and did.
So, pump was off for about 2 hours when converting and replacing equipment. SWCG is a Astral VX11 designed for up to 40k gallon pools. SWCG set at 6 out of 8 bars once salt level was ~4500. About 6 hours later, my wife texts me asking if our pool should be turning green. I returned home, and sure enough the pool was green but clear (you could see the bottom). No clumps, etc. Took in a water sample the next morning, and again got the typical FC and TC levels (FC 1) and had them test for copper and iron. Both negative. Was told to brush pool, use Baquacel Algeadefense (8 packs), and turn SWCG up to max 8 of 8. I did and the pool slowly cleared over about 3 days.
Repeated tests showed WNL levels for all except FC and TC. After a week of the SWCG running at max, I got another test with FC 0.4 TC 6.8. I decided to SLAM after that. Last night I added 18 121 oz. bottles of 6% Chlorox. Pool looked clear this morning. Took in a sample and got all levels WNL except FC 0.8 TC 1.4! Almost 2200 oz. of Chlorox and still this! Using the calculator, the FC level should have been over 40 ppm last night. So about 12 hours with no sunlight and all the chlorine is gone? Pool store says they have never seen anything like it and don't have any other suggestions. I don't want to just keep dumping ~$80 dollars worth of Chlorox in the pool indefinitely. Getting a proper test kit in the mail today and will repeat same 18 bottles tonight and test.
Would it be a good idea to keep solar cover on during the day with this much chlorine?
Any ideas or suggestions? Thanks!
Just bought a house with a underground 25,000 gallon vinyl lined rectangular pool - about 15 years old. Originally was on chlorine with Tri-chlor, Sand filter, pump is single speed 1 HP and runs 24/7.
Typical readings were all within normal limits except FC and TC. A "good" reading would be FC 1.8, TC 3.4. A typical reading was FC 0.4 (or 0), TC 8.2. Tried shocking with Cal Hypo multiple times... used 25lbs several times. Had no luck and decided it might be the filter and sand. Also had pump problems, so decided since we needed to replace pump and filter, might as well covert to a SWCG and did.
So, pump was off for about 2 hours when converting and replacing equipment. SWCG is a Astral VX11 designed for up to 40k gallon pools. SWCG set at 6 out of 8 bars once salt level was ~4500. About 6 hours later, my wife texts me asking if our pool should be turning green. I returned home, and sure enough the pool was green but clear (you could see the bottom). No clumps, etc. Took in a water sample the next morning, and again got the typical FC and TC levels (FC 1) and had them test for copper and iron. Both negative. Was told to brush pool, use Baquacel Algeadefense (8 packs), and turn SWCG up to max 8 of 8. I did and the pool slowly cleared over about 3 days.
Repeated tests showed WNL levels for all except FC and TC. After a week of the SWCG running at max, I got another test with FC 0.4 TC 6.8. I decided to SLAM after that. Last night I added 18 121 oz. bottles of 6% Chlorox. Pool looked clear this morning. Took in a sample and got all levels WNL except FC 0.8 TC 1.4! Almost 2200 oz. of Chlorox and still this! Using the calculator, the FC level should have been over 40 ppm last night. So about 12 hours with no sunlight and all the chlorine is gone? Pool store says they have never seen anything like it and don't have any other suggestions. I don't want to just keep dumping ~$80 dollars worth of Chlorox in the pool indefinitely. Getting a proper test kit in the mail today and will repeat same 18 bottles tonight and test.
Would it be a good idea to keep solar cover on during the day with this much chlorine?
Any ideas or suggestions? Thanks!