America's #1 Direct Source for Pool Supplies!

1.800.288.7946 Experts Available 24/7

Menu
Call Cart
one day delivery

1 Day Delivery

Your ZIP Code: 77072 Houston Change Location

To Houston Change
Celebrating 35+ Years!
Source / Promo Code:WYAARUNKEdit
cart overlay

    Showing 0 of 0 item View All

    Estimated SUBTOTAL* :  $0.00

    *Excludes taxes, handling fee, and EZ Pay Service Fee, if applicable.
    Source Code:WYAARUNK Edit
    LIMITED TIME ONLY!
    Receive $5 Off Select Start-Up Kits!
    Receive $5 Off Select Start-Up Kits!
    Enter coupon code STARTUP5 at checkout. Shop Now

    Pool Algaecides

    1. 5 years ago
      Great Winter Algaecide
      I buy the winterizing kit every year and a extra quart of winter algaecide to add in march never had a problem with the water when opening the pool. great products from in the swim
    2. 5 years ago
      Winter Algaecide
      I have been using the In the swim winter algaecide for about 12 years.... Works great... I put one quart in at closing and I add a quart about ten day before I open the pool in the spring.....
    3. 3 years ago
      Fabulous product
      I live in west tn the winters are mild. It gets warm under the tarp. I put the winter algrcide in at closing around the end of sept. & to be safe another bottle the end of jan its 20x40 inground. In the spring its algi free! can see 10 ft down & ready to open
    1. 2 years ago
      Excellent product
      Very happy with the results and easy of closing pool
    2. 2 years ago
      Eliminated My Yellow Algae
      We have a 15,000 gallon 16 year old concrete pool that needs to be refinished because it has corroded over the years from chemical use which creates the perfect environment for algae growth. We had mustard algea pretty much everywhere with a concentration on the sides and steps. The Super Algeacide and Super Shock totally eliminated it! It took a lot of elbow grease (brushing and vacuuming), but after a couple days and almost the entire bottle of Super Algeacide over the course of thee days, it ... read more is gone and has remained gone! Last summer I spent much more $ at our local pool supply store buying products to eliminate the mustard algea. Great product and great price!
    3. 1 year ago
      Great price for great products.
      Great value compared to other places, glad I didn’t get price gouged by the chain stores.
    1. 1 decade ago
      Money Saver
      I bought this product and kept alittle maitainence dose in my pool. My frinds were still having algea problems with every little rain or after returning from vacation. But not me! It's great and I will buy it every year!!
    2. 3 years ago
      Best Algaecide on the market
      We have used this product for at least 8 years straight now and no other product works as efficiently as this. It is costly but no other products are needed as others that need an additional product to eliminate the foam.
    3. 3 years ago
      bye bye green swamp
      My pool when from emerald green to azure in 36 hours. perfect!
    1. 3 years ago
      It works well!
      Have used this in the past and it works well enough to purchase again. It devastates any returning black algae. I had it speckled all over when I went to open my pool 2 years ago. Nothing worked till this. I did scrub all over once I put it in the first time. The algae let go and was swept up and away.
    2. 10 years ago
      GREAT PURCHASE
      THIS IS THE BEST ALGAECIDE! WHEN OTHER ALGAECIDE PRODUCTS FAIL YOU CAN COUNT ON THIS ONE TO MAKE YOUR POOL CLEAR AGAIN.
    3. 7 years ago
      Keep fighting it
      Black algae is a scourge of old pools. It gets in the gunnite and there is basically nothing you can do. You just have to keep pouring in the chemicals and watching your pool laugh at you. I am here to tell you no black algeacide works to eradicate. They all work to help control. Some are a little better than others. This one is fine. I have not seen a big difference in the super expensive black algaecides that are sold. It's all about how much active product is in the bottle. If you have black ... read more algae in your pool, my sympathies, just learn to live with it and be so happy on those days when your water looks clear and sparkling and you beging to kid yourself that it's over. It's not. Keep a bottle of algaecide close at hand at all times. Good luck!
    1. 10 months ago
      Worked fast
      I had a few patches of yellow algae on the plaster walls of my pool that other algaecides never quite got rid of. I brushed the affected areas, added Yellow Out and did a chlorine shock. The walls and water looked great the next morning! I was surprised the chlorine went from 10 ppm to 0 ppm overnight, but I just added a few more pounds of chlorine and now it is stable 2 ppm. The algae has not come back for two weeks! If it stays away two more, I will definitely buy Yellow Out again.
    2. 10 years ago
      Great alge solver
      Tried this product because when I opened the pool was a swamp. I was shocked how fast it worked and it turned my pool from green to gray with in 20 min. Just make sure you have enough shock because you need to shock your pool 3 times. I agree with other people you also need to use a clarifier to clear it up. I will use this product again. I have recommend it to all my friends a family who have a alge problem with their pool.
    3. 1 decade ago
      Finaly something that works
      We (or a friend) brought mustard algae from the lake. I spent hundreds of dollars on other chemicals in the past 3 years to get reed of the algae but it kept coming back a couple times per year, especially when we forgot to run the Polaris for a week. I tried every algaecide I could find in the stores and pool supplies companies. That's when I sent an email to ask what product would work best for my well water, salt system inground vinyl pool. Yellow out is just fantastic, It killed mustard ... read more algae overnight like nothing I tried before, with less than 2 pounds of it! Hopefully it is gone for good! Untill somebody brings some from the lake again. Tip: Make sure you ask anybody ready to swim in your pool if they used their bathing suit in a pond, lake, river, sea etc... and if they washed their suit since. That's how we ended up with mustard algae in the first place. Great product, Thanks.
    1. 1 decade ago
      Saved Me Mega Money and Time
      Two years ago....after being gone for three weeks (and having some attention by my house sitter) my pool got totally out of control. Mega algae bloom. After much effort.......I was told that by pool maintenance pros that I would have to replace the water and possibly the sand in the filter. Replacing the water did not solve the problem.....yellow algae started to return and I was facing about $1000 to change out the sand in my filter. Fortunately No Mor Problems was recommended. I have not had a ... read more problem since. Very good product....use it weekly......outstanding!!
    2. 10 years ago
      AMAZING!!!!
      This product is amazing! We lived with a murky pool all last summer, and the pool store was telling us everything was fine. This year our pool was green when we opened it and after spending at least $400 on products from our local stores (yes, we used 2 different stores) we still had a murky pool that wouldn't stay balanced, and "silt" was constantly appearring. We were told we must need to replace our sand or our filter. We then ordered No Mor Problems and watched our pool fix itself before our ... read more eyes! Within 3 days we had a beautiful pool! Two months later, our water clarity is still brilliant! All we do is treat with this product weekly and add chlorine tabs. No more copper algeacide, super blue, shock! Give it a try!!! It's well worth it!!!
    3. 1 decade ago
      Great fixer for major algae problems
      Pool has been having major algae problems and has been cloudy. No matter how much algaecide, chlorine, and clarifier I use the pool is still cloudy and not sparkling blue. One application of this immediately fix the issue the next day. I only need to use this twice a year duting the summer season with bi-weekly shocking of the pool and had no more problems as the name implies.
    1. 4 years ago
      great. timing
      We are having a cool wet summer. The algee was hard to control. I ordered your 90 day treatment on Thursday A.M.. I received it on Friday. It is GREAT, Thanks
    2. 2 years ago
      Poor it. Forget it.
      Easiest way to make sure you have algae under control for months.
    3. 2 years ago
      Seems to work
      Due to lots of rain and water temperatures around 95, we were getting heavy algae requiring frequent cleaning and diatomaceous filter changes. After through cleaning and shocking I used the recommended amount of algaecide and after 10 days no algae or filter changes. HOWEVER, the water is no longer crystal clear; it has a yellowish tint.
    1. 3 years ago
      Seems to work
      We were having trouble cleaning up our pool after a too-late spring opening. We tried a Green to Clean treatment, and the pool cleared up much more quickly. How much of this is due to the product, and how much to the associated shock treatment is hard to say, but if I ever find myself in the same predicament, I'll use the product again.
    2. 10 years ago
      Worked like a charm
      This spring the kids took the winter cover off without my help and got the filthy sludge from the cover in the pool, by the time I got it filled back up and everything back together a few days later we had a nice green mess in the pool, I knew it would take a fortune worth of chemicals to get it back, I even contemplated draining the whole pool and starting from scratch, but I saw this product and figured it was cheap enough to try. the next morning after putting it in the pool was cloudy and ... read more blue, a little claifier and a day or 2 later we were back in business. Worked great for me.
    3. 1 decade ago
      Green To Clean FAST!
      Due to a hurricane and alot of rain our pool was left with alot of debris, and with the hot , humid temperatures we had a major algae bloom within a couple of days. By the time we got power back the pool was green from top to bottom. I had ordered this product with my usual order of chlorine just to have on hand. Within a little over a day we had our pool back to normal. I really did not think it would clear it that fast, but it did. It is part of my pool staples now every year. And the price is ... read more excellent compared to a walk-in store.
    • 2019-05-21
    • bvseo_sps, prod_bvsp
    • cp_1
    • tr_24
    • loc_en_US, PRD
    • clientname_Intheswim, pc_8, tc_8
    • bvseo_sdk, java_sdk, bvseo-3.1.0
    • CLOUD, getContent, 8ms
    • SPOTLIGHTS, CATEGORY

    In The Swim Knowledge Pool: Pool Algaecides

    In The Swim's Dr. Pool

    Why Use Pool Algaecides?

    While lack of proper circulation and out-of-balance water chemistry can lead to the growth of algae in pools, even carefully maintained swimming pools can sometimes experience algae growth. It is important to use an effective treatment as soon as an algae bloom appears in your pool and it's also a good idea to take measures to prevent algae from growing in your pool in the first place.


    For killing out of control algae blooms, look to Green to Clean and Yellow Out, natural and non-toxic chlorine enhancers that boost the killing power of chlorine pool shock. Small localized areas of algae can be eradicated with In The Swim Pool Algaecide, Algaecide 50 and Algaecide 60 Plus, and a stiff pool brush. For repeated algae blooms, step up protection with our Super Algaecide, No Mor Problems or Algae Clear for stubborn situations.

    Preventing Pool Algae

    •  1. Well balanced water, with proper pH, Alkalinity, Calcium Hardness and Stabilizer levels.
    •  2. Constant and consistent chlorine level of 1-3 ppm, along with regular superchlorination to 10+ ppm.
    •  3. An effective filter; run the pump each day for 12 hours daily, more or less, depending on effectiveness.
    •  4. A clean pool; brush, skim and vacuum to remove organic debris which contributes to algae problems.
    •  5. Monitor levels of phospates in the pool. Use a phosphate remover when levels exceed 300 ppb.

    If you do all of that, and still have algae - begin an algaecide treatment with weekly doses of our Pool AlgaecideAlgaecide 50 or Algaecide 60 Plus, to assist your chlorine to combat pool algae. Algaecides accomplish this by eroding the outer protective layers of the organism, allowing chlorine to penetrate into the cells.

    Killing Pool Algae

    •  1. Clean pool of debris with skimming, vacuuming and brushing pool.
    •  2. Adjust Alkalinity to 80-120 ppm, Calcium Hardness to 180+ ppm, pH to 7.2-7.3, and stabilizer to 20-50 ppm. 
    •  3. Add Pool Shock per label instructions.
      • - For light green algae with good visibility, add 1-2 lbs of shock per 10,000 gallons.
      • - For medium green pools with visible shallow end floor, add 2-3 lbs shock per 10,000 gallons.
      • - For dark green pools with very poor visibility, use Swamp Treat or Green to Clean with a triple-dose shock.
    •  4. Brush pool and run filter overnight (remove solar blanket covers while chlorine levels are high).
    •  5. In 12 hrs, check pH and chlorine levels. If chlorine has dropped to near zero, repeat treatment.
    •  6. Continue to run filter 24/7, cleaning filter only when filter pressure rises or flow rates decrease.
    •  7. Add a Clarifier after 2-3 days, to assist your filter in removing suspended particles.
    •  8. Add an Algaecide after 4-5 days, adding an initial dosage, followed by regular maintenance doses, per label. 
    •  9. Add a Filter Cleaner after 5-7 days, to remove algae particles trapped inside of sand or cartridge pool filters 

    In The Swim's swimming pool algaecides are highly effective products which will help you keep your pool water crystal clear and algae-free. Our powerful pool algaecide will reduce the need for pool shock treatments and are safe for all pool surfaces. In addition, In The Swim's special formulas will effectively eradicate and prevent the growth of all types of pool algae. Strong algae treatments can take your pool from cloudy to crystal clear in less than 24 hours. 

    For More Info See our Algaecide eGuide:

    Pool Algaecide eGuide

    Read More | Download