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I added DE per forum recommendation, and within a few hours pressure went from 17 psi to 30 psi. I back flushed. My question is: does the DE stay in sand? Or does it have to be replaced?

Thank you for your information. Do you think it’s worth putting the diatomaceous earth in the sand filter to help with filtration?

When you vacuum, I don’t think you’re really picking it up. it just disappears for a while and then settles back to the seams. I will see if I can snap a picture tonight.

Been slamming pool. Its now clear and passes both chemical tests, brush 2-4 times a day. A couple hours after brushing, there again is debris on the seams. Is this dead algea? Which means i still have live algae on the vinyl liner? I have a sand filter.

Tf-100 and tf-2006?I am driving right now. I will have to do that tonight. Thanks.

I started my slam yesterday and my CYA was 20. I added a little bit of dry chemical to it, but wondered if I needed to monitor it until it reaches 30?

Is testing cya during the slam accurate?

It got me to today. Thanks amazon for sunday delivery! I did a test. Trued crushed. Color changed at 20 drops. Tried new powder. Color changed at 30 drops. Quite a difference

I wondered if that would work. Probably not enough product to do testing more than 2x a day over the long weekend. But I will try it. thanks.

I started my slam last night. I didnt realize my bottle of DPD powder had turned rock hard. I thought I had another bottle but didnt. I doubt any local pool store has any, thus it will be Tues/ wed before Amazon delivers. Any helpful advice?

I was surprised when i tested the water tonight. No Cl. I replaced my electronic boards late last season for my Hayward with those after market boards. Been troubling since. Says its generating, but says low salt. I bought an electronic tester, and its running 3200. confirmed by dip test as...

seems to poof away. will get a pic later, along with testing tonight. does seem to be light brown.

I keep getting a deposit along seams in the shallow end of dark debri. I can vacuum it, back flush, etc...and a few hours its back. No algae in pool anywhere, but cant figure out where its coming from. Chemical tests are good. Salt pool. any help appreciated.

yes when turn off/on a few times im in the -3400-3500 range

Because its not high. Only the hayward says its high. test strips and 2 pool stores confirm low. Here is my main question: does the hayward read salt, or TDS? If I have borax in pool, isn't it reading that along with phosphates?

I just added a bag of salt. Will try in the morning.

I hate to bring this up again, but despite trying 2 boards, I still am getting a much higher reading on the salt than is actually in pool. I've taken samples to 2 diff pool stores, and tried some steps, reading 27--2800. My hayward keeps telling me 3300-3500. Instant reading about the same...

figured out the odd numbers. it was reading in PPT, just like adjusting other things by clicking up to super chlorinate and back changed 4.2 to 4200

is it most likely the cell, or the board?

board with the high reading is hayward. board I just put in was generic

generic cell. I had another mother board. I put it in just now. After changing to t15, its says salt level is 4.. just 4, and instant salinity is -4.2....its on US measurements, as the temp says 76. the rest of t he numbers seem spot on.

first test it said -3600. after turning off for a few mins and back on, and checking it was- 4300 once and -4200 once.

after turning it off a few times, waiting a few mins, back on, instant salt wants to jump back to 4300 and 4200, rest of the numbers basically the same

-3600, 82,25.1,6.83,95...the reason I ask about salt/phosphates: If I add up salt plus phosphate from pool store reading=4100, which is what my hayward likes to display

It went right back to 4100 again today. Hayward service never did call back. Does it read just salt? Lets say your phosphate is high, is it actually adding both of these dissolved solids?

Thanks. That's a different technique. So I started at 4100. inst salt said 3600. next readings were 82, 25.5, 7.07 and 95p. box is set for t-15. after doing this it now says 3600,

T-15 cell.